Stainless Steel Racing Catalyst, B9/B9.5 Audi S4/S5
The 034Motorsport Stainless Steel Racing Catalyst for B9/B9.5 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.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.
Installation Effort: MEDIUM
The 034Motorsport Stainless Steel Racing Catalyst for B9/B9.5 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/B9.5 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.
- 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
- 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/B9.5 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
- 2018 - Present Audi S4 (B9/B9.5)
- 3.0 TFSI
- 2018 - Present Audi S5 (B9/B9.5)
- 3.0 TFSI
- This product is sold for racing use as well as use on vehicles not registered for on highway use.
- By purchasing this product, you understand that this product is sold for racing use as well as used on vehicles not registered for on highway use, and that it is not legal for use on highway or street vehicles.
- This catalyst requires a Stage 2 Racing Use Only Remap to eliminate any check engine lights due to removal of the factory catalyst.
The installation of your 034Motorsport for the B9 Audi S4/S5 3.0 TFSI is an moderately involved process that will take approximately three hours to complete. You can access our detailed installation guide by clicking the icon on the left.
Download the 034Motorsport for the B9 Audi S4/S5 Install Guide
- Dynamic+ Lowering Springs for B9/B9.5 Audi S4/S5/RS5Special Price $315.90 Regular Price $351.00
Warning: This product may contain a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.
Learn More: www.p65warnings.ca.gov