WARNING: This product can expose you to chemicals that are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, visit www.P65warnings.ca.gov.The APR Catback Exhaust System (CBK0037) is a comprehensive, high-performance exhaust solution for the Audi B9 RS4 and RS5. Unlike standard kits, this is a true "catalyst-back" system that includes downpipes extending all the way to the factory catalysts in the upper engine bay. Engineered to transform the driving experience, this system delivers a bold, aggressive growl at wide-open throttle while providing verified performance gains of 9 HP and 15 FT-LBS of torque to all four wheels.
The system features a unique and highly optimized flow path: dual 2.75” (70mm) downpipes merge via a cast Y-junction into a massive 3.5” (91mm) midpipe. To ensure a premium cabin experience, an integrated Helmholtz resonator utilizes a straight-through design with a sound-canceling port to eliminate drone without restricting flow. The rear section utilizes valve-controlled mufflers that integrate seamlessly with the OEM control system, allowing for a quiet profile during cruising and a dynamic roar during spirited driving. The system is finished with massive 7.25”x5” RS-style diamond black oval tips for a refined, motorsport-inspired aesthetic.
Features:
- Full Catalyst-Back Upgrade: A complete system including downpipes, midpipes, and rear mufflers for maximum performance.
- Verified Power Gains: Delivers an additional 9 HP and 15 FT-LBS of torque to the wheels.
- Advanced Sound Management: Integrated Helmholtz resonator cancels drone while valve-controlled mufflers retain factory-controlled sound profiles.
- Premium Construction: Mandrel-bent T304 stainless steel with brushed finish and Argon-back-purged TIG welding for ultimate durability.
- Precision Engineering: Features electropolished cast splitters and Y-junctions for ultra-smooth transitions and reduced turbulence.
- Upgraded Hardware: Includes a new upgraded tunnel brace specifically designed to clear the oversized 3.5-inch piping.
- Signature RS Styling: Finished with dual 7.25”x5” diamond black oval tips featuring a subtle laser-etched APR logo.
Product Contains:
- (2) 2.75” T304 Stainless Steel Downpipes
- (1) 3.5” Midpipe with Integrated Helmholtz Resonator
- (2) Valve-Controlled Rear Mufflers (Compatible with OEM Actuators)
- (1) Upgraded Aluminum Tunnel Brace
- (2) 7.25”x5” Diamond Black RS-Style Oval Tips
- (1) Complete Set of Precision Brackets and OEM-Style Slip Clamps
Important Note: This system is fully emissions-compliant and is designed for a hassle-free, direct bolt-on installation using factory mounting points.
Warranty: This product is supported by a Manufacturer's Warranty. Note: Manufacturer warranty terms are subject to change.
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