Hey there, fellow gearheads! If you’re looking to really wake up your B9 Audi A4 or A5, let me tell you about this Cast Stainless Steel Racing Catalyst from 034Motorsport. This isn’t just some random bolt-on; it’s designed specifically for the 2.0 TFSI engine and is a straight-up replacement for that restrictive factory catalytic converter.
What’s the big deal? Well, this bad boy is all about performance. We’re talking about a solid boost of +22 horsepower and +22 lb-ft of torque across the powerband. That means more power when you need it, and a noticeable difference in throttle response. Plus, it helps reduce turbo lag, so your turbo spools up quicker—around 100-200 RPM faster, to be exact. You’ll feel the difference every time you hit the gas.
And let’s not forget about the sound. This catalyst gives your exhaust note a nice, aggressive tone that really brings out the character of your engine. It’s like music to your ears, especially if you love that turbo whistle.
Installation? No sweat. This is a direct, bolt-in upgrade. It features a 135mm diameter Euro 3 racing catalytic converter that fits right in the factory location. You get an integrated 4-bolt flange at the turbine outlet, an O2 sensor bung, and even a 3-bolt downpipe flange. Everything you need for a clean install is included—gaskets, hardware, the works.
Now, let’s talk about the build quality. This catalyst is made from 304 stainless steel, so it’s built to last. It’s TIG-welded for strength and has a sand-blasted finish that not only looks sharp but also resists corrosion. You can trust that it’ll hold up against the elements.
Note: Just a heads up, this racing catalyst requires a Stage 2 ECU remap to avoid any check engine lights from removing the factory catalyst. Keep in mind, this is for competition use only and isn’t street legal.
So if you’re ready to take your Audi to the next level, this catalyst is a solid choice. It’s all about getting the most out of that turbocharged engine while sounding fantastic doing it.
Other Part Numbers:
034 Motorsports #VR034-105-4043
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
2016-2022 Audi S4 |
S4 | 2016-2022 |

034 Motorsport was founded in 2005 for enthusiasts by enthusiasts with a passion for bringing motorsport-quality performance upgrades and tuning to Audi and Volkswagen vehicles. Since its inception, the company has grown to meet the expanding needs of petrolheads with innovation, quality, and performance in mind. 034 Motorsport is dedicated to providing customers with only the finest performance products, tuning, and service for their Audi or Volkswagen.
Dedicated to the Car Scene034Motorsport is owned and operated by car enthusiasts just like you! This means that you can count on them for expert advice and products that deliver each and every time. When they aren’t at work, you can find the 034 Motorsport folks at local car meets, Audi Club Track Days, or simply at home working on their own rides.
Being gearheads themselves, the 034 Motorsport staff understands the importance of a strong automotive community and giving back to the customers they owe their success to. 034Motorsport is a proud sponsor of Audi Club North America's Golden Gate Chapter, in addition to several other popular automotive forums, including Audizine, Fourtitude, VWvortex, and QuattroWorld. The brand also supports NorCal Audi Club, and frequently hosts events for its members.
Involvement in Competition Racing034Motorsport stays true to its roots (and name) by actively participating in motorsport events, like time attacks, endurance racing, and hill climbs. These events allow the company to simultaneously showcase its products and racing expertise, while putting them to the ultimate test. A number of 034 Motorsport’s most iconic projects, including the Time Attack A4, GTI-RS, and 80tq raised the bar for on-track performance, while also accelerating production and testing processes.
Extensive Quality Product Lineup034 Motorsport is well-known for producing some of the finest race-proven performance upgrades for Audi and Volkswagen enthusiasts. The 034 Motorsport performance facility is located in Fremont, California and home to its engineering, manufacturing, and tuning departments. The company prides itself on in-house manufacturing, where it designs, fabricates, calibrates, and tests all products under one roof with complete control. 034 Motorsport carries a wide range of products that includes suspension parts, motor mounts, intakes, silicone hoses, and numerous underhood goodies.
Find 034 Motorsport at Vivid RacingYou can find an extensive lineup of quality 034 Motorsport parts right here at Vivid Racing. We carry everything from 034 Motorsport blow-off valves, cold air intakes, intercoolers, differentials, and ventilation systems to wheel spacers, springs, turbos, mid-pipes, and steering components. Whatever you may possibly need, chances are we carry it! If you cannot find a particular item above or have any questions, please call our sales team at (480) 966-3040.
It is the intention of 034Motorsport to sell only quality products. We offer a 1-year warranty against defects in workmanship or materials, not extending to normal tear and wear or mis-use. You must provide us with a proof of purchase, defect or the result of wear or mis-use. Some products have less than 1-year warranty. Please inquire before ordering.
034Motorsport will only replace or repair warranty items. No refunds will be given. 034Motorsport or the product manufacturer will inspect or test all products prior to a warranty claim adjustment. This process may take up to 6 weeks. You must obtain an RMA number from either Customer Service or Technical Support prior to any return. All products we offer are warranted to be free from defects prior to installation. Any modification or improper use voids this warranty. This warranty does not cover installation. 034Motorsport shall be the final arbitrator in interpreting the extent and remedy of warranty.
034Motorsport warranties are not transferrable, and available to the original purchaser only, however if you do buy a 034Motorsport part second hand and have a problem with it, do contact us as we can typically arrive at a reasonable, fair solution.