Catted vs catless downpipe bmw. Past: FBO 2015 BMW M4, 2010 Audi S5, 2019 X4 M40i.

Catted vs catless downpipe bmw Catless Options Guest-only advertisement. Sep 23, 2022 · Out now: Our all-new high flow catted downpipes for the 2021+ BMW G8X M3 & M4. Make an informed choice for your next upgrade. Real-World Variability: Actual fuel consumption changes can vary widely based on individual driving conditions and vehicle modifications. Explore a comprehensive comparison between catted and catless downpipes, examining performance, emissions, sound, and other considerations that influence your choice. BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > 4. BMW Garage: BMW Meets: Register: Today's Posts: Like many of you, I thought a LOT about catless vs catted downpipes. 5″ BMW X3 M40iX G01 & X4 M40iX G02 B58 Stainless Steel Downpipe 3 inch VRSF Catless downpipe VS 3 inch mmp catless downpipes OR the 3 inch VRSF Catted downpipe. #car #cars #bmw #440i”. This makes them a more environmentally responsible choice and ensures compliance with emissions testing in many The BMW N54 market is clear proof that the bracket is simply another over engineered inclusion from BMW in order to make it easier for techs to align the downpipe with the turbo and catback. BMW Garage: BMW Meets: 833 Likes, 38 Comments. 2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted Downpipes vs. Discover performance benefits and sound changes. Most catted downpipes come with a “high flow sports cat”, which are less restrictive catalytic converters that allow for improved performance while still passing emission tests. Aftermarket Downpipes. Apr 10, 2022 · Comparison of the stock exhaust, a dual resonator delete, and the dual res delete with the Active Autowerke high flow catted downpipe. Works very well on Stage 2, 2 Feb 15, 2024 · For example, I went from a catted downpipe with cat back exhaust on my GTI to a catless resonated downpipe with the stock exhaust. Catless for faster and louder spool. Similar to it's brother the N55, the N20 has a stock downpipe with a catalyst that drastically restricts exhaust flow. BMW 335/135 Catted Downpipes (High-Flow) ((RHD Model)- The price is on the higher side at $950. Any chime in on their experience with catted downpipes ? Cheers Yes I have looked around but doesn't seem like anyone does catted. VRSF 4. 5″ Race Downpipe for BMW B58 1 I have a race catted Downpipe from active autowerke that was advertised CEL free guaranteed. I'm really looking to hear from people who have purchased the VRSF catted downpipe to provide an up-to-date review on the exhaust note, drone, smell increase, etc. Very excited to say the least. It was $1400 for just the pipe Jun 3, 2023 · The Active Autowerke downpipe is the top-tier choice for catted downpipes. is it worth it to get a catted down pipe i can't deside which one to buy to run stage 2 in this thread in this sub-forum in the entire site Welcome to our exhaust sound demonstration! In this video, we show off our 2023 BMW M340i by comparing the stock exhaust system to the upgraded Active Autowe The downpipe carries exhaust gas from the hot side of your turbo to the rest of the exhaust system. Do not compromise performance and sound with factory parts – unleash your BMW’s potential! Designed using the latest in CAD technology; this part is made to fit perfectly in place of your Read More "CTS Turbo BMW F2X/F3X/G20/G30 230i/330i/430i/530i & xDrive Note: While we do offer a lifetime warranty on the downpipes, we only offer a 1 year warranty on the ceramic coating and high flow cat. You won't have to worry about fuel smells or check engine light issues; that's a guarantee. S63 catless vs high-flow catted downpipes. Sep 17, 2023 · There is no power difference on stock cars between catless and high-flow catted. It uses GESI cats, which are EPA approved. Purchasing a VRSF downpipe comes with peace Yes, a catless downpipe will sound noticeably more aggressive. Do not compromise performance and sound with factory parts – unleash your BMW’s potential! Designed using the latest in CAD technology; this part is made to fit perfectly in place of your factory downpipe. My understanding is that if you do run catless down pipes you need a o2 simulator to take care of the check engine light. Sep 12, 2024 · Among the best bolt-on upgrades are a set of catless or high-flow catted downpipes. Customization: Catted downpipes offer customization options with various catalytic converter types and sizes. We are proud to introduce our VRSF race & high flow catted downpipe for your B58 M240i, 340i, 440i, 540i, 740i & xDrive variants. Long story short. Catless (Help with choice & real world comparison)? The Mad Catless B58 Downpipe is an essential upgrade for any BMW enthusiast looking to maximize the performance of their B58 engine. Catless downpipes might be more susceptible to heat and exhaust gas damage. Catless is louder than both but also raspy and generates a fuel smell. I'm running catless downpipes with stock catted midpipe and I only get a gas smell when I'm idling in my garage. Please note that the warranty on the catted downpipe is limited to two years. All VRSF downpipes are hand crafted from SS304 grade stainless steel and include a lifetime warranty as well as our “No Hassle” satisfaction guarantee (includes fitment). For more information about the BMW N63 engine including engine specs, common problems, and popular modifications, take a look at our dedicated BMW N63 Engine Page . I've had a few of my friends tell me to get a downpipe, specifically a catless VRSF dp for louder sound (unrestricted) and better performance. You can see light coming through at a certain angle. The volume is slightly lower but the tone is higher and a tad raspy. High Flow Catted Vs Catless Yea, there's also a lot that goes into sound differences. Jun 30, 2020 · In this guide, we will compare N63 catless and catted downpipes, lay out the pros and cons of each, and list a few of the best N63 upgraded downpipes. More on the specific gains of each in the next section. Learn how these components impact your vehicle's performance and emissions. Of course, each state has different laws, so it's not 100%. Jul 2, 2020 · *Continuing the trend, high-flow catted S55 upgraded downpipes are louder than stock but to less of an extent than catless DP’s. These downpipes are THE best bang for the buck mod available for your B58 and they’re available in both race & high flow configurations. Catted systems may be more durable due to the protective nature of the catalytic converter. I Feb 20, 2025 · The durability of catted and catless downpipes can vary. This limits not only the amount of power N20 can make on the stock tune, but also prevents upgrading to a stage 2 tune due to excessive back-pressure. See full list on bmwtuning. Catted vs catless down pipe? Hub for all BMW 3 series, 2006-2013. Is anyone running a VRSF Catted downpipe on their 540i? Wanna get downpipes for my m4, I know most people say just to go with the cheapest one just wondering if PLM is a trustable/good quality downpipe brand for the m4 f82, It's insanely cheap I found a seller on facebook for like $275 whereas vrsf is $479, I just want something that gives that release of pressure to the engine with decat, hence more horsepower, and increased sound. 99 + BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Catted vs Catless Google Search Search Forums The ARM Motorsports N20 Downpipe is the best hardware upgrade to get the most power from your 320i or 328i. 2011 – 2012 E82/E88 BMW 1M N54. 4K views 54 replies 9 participants last post by williams Aug 29, 2019 Power gains are the same on catted vs catless with stock turbo Catless sounds more aggressive but smells, catted does not smell. I have an mst intake & bm3 stage 1! All VRSF downpipes are hand crafted from SS304 grade stainless steel and include a lifetime warranty as well as our “No Hassle” satisfaction guarantee (includes fitment). Not all downpipes are created equal. My personal recommendation is to go for catted high-flow downpipe. Don't overthink it. Pros: Maximum flow capability and power gains; Aggressive exhaust tone when combined with other mods; Cons: Not legal/compliant in many areas due to no cats Jan 5, 2022 · Sport Cat Downpipes vs. So I sold it and bought catted one. Ordered the 3″ catless downpipes for my n54 335i. 5″ G20/G22/G26 B58 Stainless Steel Downpipe Made with full 304 Stainless Steel and 3" construction these downpipes provide a significant increase in power and torque over the OEM catted downpipes. High HP and torque gains. I could use advice on this. N54 downpipe mods are really only intended for off-road use. We’ll somewhat dive into the specific performance gains of catless vs catted F90 M5 downpipes below. Catted: Keep the catalytic converter Sep 21, 2022 · I would opt for high flow catted vs catless. Smooth radius bends decrease turbulence and increase flow. I'm torn between a few options: MAD Catted Downpipe (around $400), Catless Downpipe (around $250-300), and Active Autowerke Catted Downpipe (around $1,500). Stock downpipes are built for compromise. Picking up a car with MPE installed. The catalyst is like a sponge that absorbs a lot of that higher pitched rasp, a resonator is a straight through piece of pipe with some Catted downpipes and catless downpipes. 0 engine vehicles. VRSF Catted Downpipes for 2019 – 2022 BMW X3M & X4M S58 F97 F98 VRSF Racing Downpipes S58 2020 – 2023 BMW M3 & M4 G80, G82, G83 – 10802058. LOUD AF with valves open Raspy S55 noises Smelly Zero restriction = fast Check engine light Won’t pass emissions I am going to swap out to high flow, resonated catted downpipes to reduce stank and be a bit more environmentally friendly, and go for a single midpipe. Bringing even more performance & exciting exhaust sounds to your vehicle. This bounce back creates resistance for the turbo compressor, which reduces spool. Catted downpipes incorporate a catalytic converter, making them the road-legal option. 2012-2015 BMW 3-Series and 4-Series Forum. The active autowerke downpipes use EPA-approved GESI cats; you are much more likely to pass emissions with these downpipes. Is the smell actually bad? If so, I will have to go with the catted then Mar 27, 2024 · Choice between catless and catted downpipe. Aug 25, 2019 · Catless downpipe? Jump to Latest 8. A catted downpipe retains the catalytic converter but features a more efficient, high-flow design. Past: FBO 2015 BMW M4, 2010 Audi S5, 2019 X4 M40i. However, this post is primarily focused on catless options as they offer the best bang for the buck. com. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is reduced significantly which results in faster spool, an increase in power & a more aggressive exhaust note. I'm looking at the VRSF B58 catless and high flow catted Downpipe. the only exception to this is the active autowerke downpipe as they use GESI cats which do not trigger a check engine light _____ traditionally the catless downpipe made more power than the catted downpipe due to the cat material slowing down the air flow. . There's too much focus on maximizing every once of power in the online community but at what compromise? I'm shooting for 400-425whp that I can daily. Feb 19, 2025 · The VRSF 3. Catless downpipes are an off road only modification and should not be used on the street. Catted downpipes provide slightly less horsepower (about 5-10 lesser) but they have much more pros than the catless version: significantly less emission, no unpleasant smell, and has lesser chances of Nov 29, 2021 · Catless downpipes with a tune usually net about 20-30 whp and 30-50 wtq. B58 Catless vs. Catless: The choice between a catted and catless downpipe can influence fuel consumption, but the difference is often minimal. They also promised to replace it if there was one The first time I got a CEL (unrelated to Downpipe) they were very helpful and were ready to replace it when I called. VRSF Racing Downpipes B48 G & F Chassis 2016 – 2021 BMW 120i, 220i, 230i, 320i, 330e, 330i, 420i, 430i, 630i, 730i & xDrive SKU: 10302075 Rated 4. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction). The catback is APR which stays the same in b Jan 31, 2022 · Catless vs. The 5" versions will give the CEL, and sound horrible (boomy raspy sound). Note: The catted version is limited to LHD fitments. Catted Downpipes - Page 3 Bimmerpost ☰ Model Selection Performance Parts For Your Bmw At Crazy Low Prices! Email: info@mad-us. Mar 4, 2021 · BMW M5 Catless vs Catted DP’s. If you want the power, with no fuel smell and a slight upgrade in exhaust tone catted is the way to go Dec 19, 2021 · Catless downpipes with a tune usually net about 20-30 whp and 30-50 wtq. Anyone is welcome! Members Online. 5″ downpipe upgrade is THE best bang for the buck mod available for your N55 135i & 335i/xi. ApexBuilt G8X HFC downpipes offer perfect fitment, drastically improved throttle response & exhaust note vs OEM, and a lifetime warranty. VRSF BMW X4 M40i & M40iX N55 Stainless Steel Down Pipe Upgrade. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is significantly reduced which results in faster spool, an increase in power & a more aggressive exhaust note. Made from high-quality materials, this downpipe is designed to provide maximum exhaust flow and improve turbo spool time, resulting in increased horsepower and torque. Made from mandrel bent, tig welded 304 grade stainless steel. The CTS Turbo Catless Downpipe BMW B58 is made to maximize exhaust flow for highest power gains. 5" vs 5" catless downpipe Google Search Search Forums Jul 7, 2022 · You can change the secondary downpipes, no check engine light. In addition to the massive power gains, these downpipes open up an incredible exhaust sound from the turbocharged V8 that will shock and awe onlookers! The cost of a catless exhaust system typically ranges as follows: Catless Downpipe: $150 - $800 Catless Full Exhaust System: $400 - $2,000 Installation: $100 - $500 Prices depend on the vehicle model and brand. I'd like to retain the MPE note as it's perfect. Stick to catted downpipes with the 4" catalyst vs those bragging 5" on a 4" downpipe. Oct 5, 2020 · For a quick answer, catted downpipe is better than catless downpipe if you are driving on the street – especially if the car is a daily driver. Car: 2011 E90 335i X-drive AT New to BMW, have been a 15' GTI guy for a while. Suitable for BMW/Toyota B58 3. “No Hassle” satisfaction guarantee. Also, ha Alternatives to Catless Downpipes Catted Downpipes. The catted option is better for the stock turbo; it's louder than stock but not raspy and has a deeper mid-range tone. ⁣ ⁣ Our BMW G8X HFC downpipes utilize GESI GEN1 UHO metal-core 300cpsi cats, rated for 500-800 horsepower applications. Hey guys ! I have a 2020 330i b46 and was wondering what's the best downpipe and the difference between catted and catless. An N20 downpipe This is one of the highest-efficiency downpipes worldwide. co Anyone have suggestions on doing catted downpipes vs catless - I was told on this forum there are some issues doing catless with o2 sensors etc and obvious emissions. Should work the same vise versa. Appreciate 0 the exhaust system starts after the turbine wheel, so your downpipe is the first piece (arguably it includes the headers & turbine, but we'll just call that part of the forced induction system) of the exhaust, then the cats, then the piping. burbletune. Are you still in confusion as to what downpipe to go for? We are proud to introduce our VRSF race & high flow catted downpipe for your B58 M240i, 340i, 440i, 540i, 740i & xDrive variants. The catted downpipe is an APR and the Catless is ARM. I dont think I will pass inspection with a catless downpipe but I still want that aggressive tone to my exhaust. Aug 3, 2020 · Hey guys I am wondering how catted downpipes sound on the M5. https://www. F40Model Year: 2019 + THE LARGEST BMW 2-SERIES FORUM ON THE PLANET. Manufactured from T304 stainless Read More "CTS Turbo 4. There is still some smell, but significantly better compared to catless setup. BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > Best Downpipe For B58 Google Search Search Forums Nov 9, 2012 · BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted vs Catless Downpipes Google Search Dec 10, 2024 · Emissions and Environmental Impact Emission control is one of the most significant differences between catted and catless downpipes. yes you can run a catless down pipe with a catless exhaust system or any combo of a catted or non catted down pipe or exhaust. Jun 29, 2020 · N20 Catless Downpipe vs High-Flow Catted Downpipe Catless downpipe options for the N20 are the least restrictive, and will result in the best power gains and spool. Jul 13, 2023 · Best Catted Downpipe F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 I don't want to go catless but what other high-flow downpipes should I look Exhaust comparison between a Catless Downpipe from VRSF and a Catted Downpipe with a high flow cat from Evolution Racewerks. Sep 6, 2021 · cts or arm catted downpipe vs stock Hey guys, i'm looking to upgrade my stock dp to some highflow catted dp for better exhaust sound and slightly better power, and not really interested in paying $1500-3000 for dp. VRSF Downpipe - Catted vs Catless. High Flow Downpipes Jul 5, 2020 · Learn about BMW S63 upgraded downpipes (DP's). 01-05-2022 10:12 PM #2. So you are just going with new turbo then aka diverter was good? I'm not sure how much bigger that turbo is, but You idle your car a lot and Id hate for you to have exhaust smell that bad all the time, at least catted allows SOME control. The B48 downpipe fits the BMW 120I 125I 220I 230I 320I 330E 330I 420I 430I 520I 530I 530E 630I 730I 740E X3 X4 20I 30i F40 M135I X1 F48 X2 F39 MINI F54 F55 F56 F57 F60 COOPER S JCW Apr 3, 2024 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The CTS Turbo downpipe for the BMW B46 North American Market vehicles is made to maximize exhaust flow for the highest power gains. However, catless downpipes do have a significant pitfall for some. instagram. BMW S63tu upgaded DP's performance, hp, and sound. The tuner said doing catless wont sound good. If you change the primary downpipe to catless or catted, it will trigger the check engine light. In this guide, we discuss S58 downpipe upgrades including power gains, sound, catless vs high-flow, and more. VRSF offers both catless and catted versions of their N55 downpipe. TikTok video from whychriis (@whychriis): “Explore the differences between catted and catless downpipes for BMW 440i. Jun 18, 2024 · I'm looking to upgrade my BMW G20 M340i with a new downpipe and pair it with a muffler delete to enhance performance and sound. In these videos I have Feb 25, 2016 · BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > B58 Turbo Engine / Drivetrain / Exhaust Modifications > B58 BMW 340 VM 4" CátLess D0wnpipe Dyno Testing - Before and After Results No cats equals more power faster because of less exhaust restrictions. May 12, 2021 · Both catless and high-flow catted downpipes are generally illegal. Catted vs. Because catted downpipes contain a catalytic converter, they significantly reduce harmful pollutants. VRSF Catted Downpipes for 2019 – 2022 BMW X3M & X4M S58 F97 F98 $ 599. I don’t really care about inspection tests as I don’t need to get them here in Canada. Aftermarket downpipes prioritize flow and power gains. The idea of a downpipe upgrade is to reduce back-pressure. Discover the key differences between catted and catless downpipes for your BMW. Having either your primary or secondary cats should heavily reduce the smell. 1. On a rear wheel drive, that should keep things lively enough Need to keep things legal, so catless isn't on the cards sadly. Took about a week to I am looking to get a downpipe for my F30 335i N55 engine. F30 is a sub dedicated to all things 2011 - 2019 BMW 3 series. The most popular N54 and N55 downpipes do not have mounting brackets and there are even less mounting points for the catback whereas the B58 has Feb 6, 2015 · BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Downpipe catless vs catted help Google Search Search Forums I have catless downpipes and an AWE full exhaust. There's a ton of conflicting info on the web regarding catless vs catted DP's especially for novices like me but your rational makes a lot of sense. 99 + VRSF Racing Downpipes for V8 N63R 2017 – 2021 BMW M550i, 750i, 850i, X5 M50i, X6 . back to the point of the thread: Downpipe!! I want to run Stage2 and push for around 460 horses, so a pipe is definitely needed. They balance performance, noise, and emissions. Catted or Catless Downpipes: Pros and Cons. 93 out of 5 based on 14 customer ratings We are proud to introduce our VRSF Race Down Pipe for your N20 & N26 BMW. Ask technical questions, contribute answers, or show off your ride. Aug 9, 2006 · What is the HP lose for a catted downpipe vs a catless downpipe. Catless Downpipes. BUSINESS HOURS 7am-5pm Pacific Time Went with catless on my F10 535i Unfortunately if you daily the car the smell is quite unpleasant (feels like/worse than a diesel). Features* Largest diameter downpipe for B58 wor Sep 10, 2023 · High-flow catted downpipes – 200 cell high flow cats; Catted downpipes – series of standalone catalytic converters; Let’s compare the pros and cons of each design: Catless Downpipes. If you live in a place where emissions testing is required Apr 27, 2024 · Catted (high flow): Good ones won't trigger the CEL, and have marginally less performance than catless. Let’s break down your options. Replace a faulty catted downpipe with an OEM downpipe or upgrade for more performance with our selection of aftermarket performance downpipe options. Oct 8, 2023 · I’ve got MAD catted downpipes and love them personally Paired with their single midpipe and it sounds great. 00; Note: Some of these downpipes are available in both catless and catted versions. If you look into the stock downpipe, you can't even see light come through the other side. the only pro for catless over high flow catted is the cheaper cost. The standard catted downpipe is unlikely to pass emission in most states since they trigger the check engine light. com/TURBOSPOOLE85/I wanted to answer the question if there is in fact a difference in power between a high-flow cat downpipe, and a cat Oct 13, 2024 · Types of Downpipes for BMW M4. What do you think sounds better? Apr 22, 2014 · BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Catted downpipes vs catless downpipes Google Search Oct 7, 2022 · 2022 X3 M40i Hi, new to the community here with my first Bimmer as an M40i. Apr 7, 2020 · B46/B48 Catless vs High-Flow Catted Downpipe Catless downpipes are the least restrictive option, and will therefore provide the best power gains. If you don’t need the catted downpipe for emission regulations, I would recommend choosing the catless downpipe for optimal sound and performance. I think you can spend 3k on much more Catless downpipes are one of the best mods for performance you can do to your N54. Aftermarket BMW B48 Downpipe Catless or High Flow Catted will improve flow and performance. It's also one of the most tested downpipes available, with hundreds currently Nov 5, 2023 · Sound clip differences between catless and catted downpipes. Only worry is I have an e93 (convertible) and worried that it might be a very strong smell if I have catless downpipes n the roof is dropped. Feb 1, 2023 · I’ve been recently looking for a high flow catted downpipe so that I could take my g20 330i to stage 2. If performance is your concern/goal I think there’s negligible difference between most, some say even Catted vs catless. They are also cheaper to produce since the catalytic substrate costs a good deal of money, plus the fitment of a strait section of wider pipe always makes plumbing more difficult than the simple strait piping of a catless design. From: $ 569. Overall length of exhaust, turbo sizing, muffler design, etc. May 15, 2024 · Depends on the catted downpipe but I would say our catless is about 30-40% louder +- 10% depending on the rest of the exhaust. An aftermarket catted dp uses a high flow cat with fewer, wider cells. This downpipe is THE best bang for the buck mod available. High-flow catted downpipes may pass emissions in some states, but tampering with OE emissions equipment may still be illegal. Going catless over the stock downpipes can yield gains of 25+ horsepower. By replacing the factory downpipe/catalytic converter with our Sports Series High Flow Metallic Catted Downpipe, more power is unleashed! We use a 200 cell metallic core for our Sports Series High Flow Catted Downpipes. So it’s definitely possible. BMW S55 Upgraded Downpipe Options Let’s move on to a few of the popular, quality S55 downpipe options. Bimmerpost ☰ Model Selection. Catless down pipe and emission help! BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Bmw b48 downpipe choices Google Search Search Forums Now. the power gains from nonOEM exhaust systems come from reduced backpressure - the engine no longer has to Description. Upgraded downpipes help reduce backpressure and improve turbo spool, which results in impressive performance gains. If any have any CEL issues, AA replaces the downpipe asap. I would like to get catless but I'm worried about the smell so I am thinking about doing catted. For those who want performance improvements without sacrificing emissions compliance, a catted downpipe is a great alternative. Understanding Downpipes and Fuel Consumption Apr 2, 2020 · When your turbo dumps a bunch of air into the downpipe, but the downpipe is restrictive, the air bounces back from the downpipe to the turbo. Stock vs. I think what you're worried about is an exhaust leak, and exhaust leaks typically sound more like a hissing. Again, easy to spend your money but something like this. szf upuu krjoqy nhshmja gmhjy ipybev nvsjlj mcpbe okg flixk timquxh qweqlb ihou xwfn kdisu