034Motorsport Stainless Steel Racing Catalyst, B9/B9.5 Audi SQ5

The 034Motorsport Stainless Steel Racing Catalyst (034-105-4058) is the premier high-flow exhaust upgrade for the B9 and B9.5 Audi SQ5. Designed to replace the restrictive factory catalytic converter, this unit features a massive 148mm Euro4 200-cell racing catalyst positioned in the factory location to maximize exhaust velocity and reduce backpressure. By optimizing flow, this "racing cat" enables the 3.0T EA839 engine to produce more power and torque while significantly reducing turbocharger spool time by 150–300 RPM.

Constructed from TIG-welded 304 stainless steel, this catalyst is built for extreme durability and track use. It features a precision CNC-machined v-band turbine outlet and 3-bolt downpipe flanges for a perfect, leak-free seal. To protect the engine bay from heat soak, 034Motorsport has integrated an OE-style heat isolation barrier, ensuring that the increased exhaust temperatures do not compromise surrounding sensitive components.

Key Features:

• Increased Performance: Substantial horsepower and torque gains across the entire powerband.
• Faster Turbo Spool: Reduces transient response time with 150–300 RPM quicker spool-up.
• High-Flow Racing Core: Features a 148mm Euro4 200-cell metal matrix catalyst for optimal flow/filtration balance.
• Thermal Management: Integrated OE-style heat shield keeps engine bay temperatures in check during hard use.
• Premium Construction: TIG-welded and backpurged 304 stainless steel with precision CNC-machined flanges.
• True Bolt-In Fitment: A direct-fit upgrade that maintains the factory oxygen sensor location and mounting points.

Technical Specifications:

Emissions & Tuning Note: This product is intended for Sanctioned Racing use only. Installation will cause a Check Engine Light (MIL) on factory software. A Stage 2 ECU calibration is required to optimize performance and eliminate the MIL.