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)
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.
Fitment Guide
Make
Model
Years
Chassis
Engine
Audi
S4
2018-Present
B9
3.0 TFSI
Audi
S5
2018-Present
B9
3.0 TFSI
Install Guide
The installation of your 034Motorsport Stainless Steel Racing Catalyst 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.
