SKU: 63865130275

034Motorsport Stainless Steel Racing Catalyst | B9 Audi S4/S5

Sale price$1101.60 Regular price$1224.00
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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20

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Description

034Motorsport Stainless Steel Racing Catalyst | B9 Audi S4/S5The 034Motorsport Stainless Steel Racing Catalyst for B9 Audi S4 S5 is designed as a drop in replacement for the restrictive factory catalytic converter. The Stainless Steel Racing Catalyst offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and an enhanced exhaust note. This upgrade eliminates the primary flow limitation in the factory exhaust system, allowing you to maximize the

The 034Motorsport Stainless Steel Racing Catalyst for B9 Audi S4/S5 is designed as a drop-in replacement for the restrictive factory catalytic converter. The Stainless Steel Racing Catalyst offers increased horsepower and torque throughout the powerband, reduced turbocharger lag, improved throttle response, and an enhanced exhaust note. This upgrade eliminates the primary flow limitation in the factory exhaust system, allowing you to maximize the potential of your turbocharged engine.

Optimized for increased flow and maximum performance, the Stainless Steel Racing Catalyst features a massive 148mm diameter Euro 4 racing catalytic converter in the factory location. This complete drop-in solution includes an integrated v-band flange at the turbine outlet, integrated oxygen sensor bung after the catalyst, integrated 3-bolt downpipe flanges, and a complete gasket/hardware kit to allow for precise fitment and ease of installation. The Stainless Steel Racing Catalyst for B9 Audi S4/S5 vehicles is constructed from 304 stainless steel for maximum durability and corrosion resistance, is TIG-welded, and includes an integrated OE style heat isolation barrier to minimize exhaust heat transferred into the engine bay.

034Motorsport's Stainless Steel Racing Catalyst was developed entirely in-house on 034Motorsport's Development B9 Audi S4 utilizing the latest in 3D Scanning Technology, CAD Software, and Rapid Prototyping Techniques. Final production units were then tested extensively on track in B9 Audi S4 vehicles before release.

FEATURES:

  • Increased Horsepower & Torque Throughout the Powerband (+ 21 HP / + 33 TQ Peak)
  • Quicker Turbocharger Spool & Faster Transient Response (150-300 RPM Quicker Spool)
  • Enhanced Exhaust Note & Turbocharger Sounds
  • Direct, Bolt-In Upgrade for Factory Catalytic Converter
  • Engineered In-House by 034Motorsport's Engineering Team
  • Factory-Location 148mm Euro 4 Racing Catalytic Converter
  • 304 Stainless Steel Construction with Integrated Inlet/Outlet Flanges & O2 Sensor Bung
  • Precision CNC-Machined Flange Mating Surfaces
  • OE Style Heat Isolation Barrier
  • TIG Welded & Backpurged

WHAT'S INCLUDED:

  • 034Motorsport Stainless Steel Performance Downpipe
  • Integrated Euro 4 Racing Catalytic Converter
  • Factory Turbocharger Outlet Gasket
  • Factory Catalyst to Downpipe Gaskets (2)
  • M8 Locknuts (6)
  • M8x30 Socket Head Cap Screws (4)
  • M8 Washers (4)

034MOTORSPORT B9 AUDI S4 3.0 TFSI RACE CATALYST PERFORMANCE COMPARISONS

These Performance Comparisons were performed using an in-house 2018 Audi S4 3.0 TFSI on 91 Octane fuel.

FACTORY CATALYST (91 OCTANE) 034 RACE CATALYST (91 OCTANE)
Peak Horsepower 304 HP 320 HP
Peak Torque 332 FT-LBS 348 FT-LBS
Peak HP Gains vs. Factory Catalyst - 21 HP @ 5,680 RPM
Peak TQ Gains vs. Factory Catalyst - 33 FT-LBS @ 2,525 RPM

FACTORY CATALYST VS. 034 RACE CATALYST - 91 OCTANE

034 RACE CATALYST POWER GAINS - 91 OCTANE

SUPPORTED VEHICLES

  • 2018 - Present Audi S4 (B9)
    • 3.0 TFSI
  • 2018 - Present Audi S5 (B9)
    • 3.0 TFSI

EMISSIONS DISCLAIMER

  • This product is sold for off-road use only.
  • By purchasing this product, you understand this product is sold for competition use and is not legal for use in highway or street vehicles.
  • This product will cause a check engine light (MIL) on the stock factory tuning. A racing ECU calibration for offroad use only is required to eliminate the check engine light.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 63865130275

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zee
Port Orchard, US
★★★★★ 5
Great toys for aggressive chewers
Size: Medium/Large, Color: Turkey Day Drumstick - Large
These are great toys they last a while they are destroyed after a while but both dogs are aggressive chewers but they last about a year and a half. And they are go to toys they have one that is a shark mouth and they love it I have bought 4. (two of them the pups lost ).
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Reviewed in the United States on December 20, 2025
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Anjelica
Houston, US
★★★★★ 4
Durable and Fun, Just Gets a Bit Rough
Size: Medium/Large, Color: Chopper - Large
This is a really good toy overall, especially if you have dogs that love to chew. My dogs were immediately into it—they play with it nonstop, toss it around, and stay entertained for a while, which I love. It definitely holds up better than most toys we’ve tried. The only reason I’m giving it 4 stars instead of 5 is because over time it does start to fray a bit and gets a little rough, especially with heavy chewing. It’s not completely indestructible, but it still lasts longer than a lot of other toys. Overall, still a great buy and I would recommend it if your dogs need something tough but fun!
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Reviewed in the United States on April 4, 2026
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Lina
Belleville, US
★★★★★ 5
Worthwhile!
Size: Medium/Large, Color: Turkey Day Drumstick - Large
I have a small dog with a really strong bite! Usually have to buy toys that are meant for bigger dogs. This has lasted us for what feels like forever. It does sound very heavy when dropped! My dog loves it though! Would definitely recommend!
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Reviewed in the United States on May 2, 2026
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Kelly
Cuba, US
★★★★★ 5
Ohhh Mr. Iguana
Size: Medium/Large, Color: Illana the Iguana - Large
Mr. Iguana is a house favorite! I got my first one of these in a barkbox and my dog loved it so much, i went on the hunt for another one. Amazon saved the day! I own about 7 of these now. They are prefect for dogs just love to chew, they hold up great! And they are heavy duty, super easy to clean! My dogs are very happy, great value for the money! Doesn't have a smell, vibrant colors! Noise level is quiet, minus my dogs chewing !
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Reviewed in the United States on August 13, 2025
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sec682
Draper, US
★★★★★ 3
Not for strong chewers
Size: Medium/Large, Color: Dog Ness Monster - Large
Initially, I really liked this for my dog. She is about 8 months old and still loves to chew and destroys most toys in a few minutes. When we got this, it seemed like it would hold up for a while despite being clearly gnawed on. Unfortunately, once she focused on the softer "water" portion of the toy, that is where things went downhill with this toy. After a few short chew sessions, she was tearing chunks out of it. We had purchased a replacement since she liked the original so much, and after about 5 minutes with the replacement, she had taken enough out of the blue section that we immediately threw that one out as well. Overall while the green portion held up, the blue didn't. I can't recommend this for strong chewers.
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Reviewed in the United States on December 8, 2025

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