APR Catback Exhaust System - RS4 / RS5 (B9) - CBK0037

Designed for enthusiasts seeking the perfect balance of power, sound, style, and quality, the APR Catback Exhaust System for the Audi B9 RS4 and RS5 is a testament to engineering excellence. With its performance-driven design and durable construction, this system not only transforms your driving experience but also ensures years of reliable performance.

This Part Fits:

Year	Make	Model	Submodel	Notes

Specifications:

quality	Quality - null
Bending	Mandrel
Brackets	Precise
Brand	APR
Category	Exhaust
Clamp Style	Slip Clamp
1882	Yes
Emission Code	5
11205	Black
Exit Tube Diameter	2.5
Material	T304 Stainless Steel
9882	Brushed
Muffler Style	Sound Absorption, Helmholtz
Product Type	Exhausts (Catback Systems)
Sub Category	Exhaust and Tail Pipes
Tip Count	2
Tip Diameter	7.25x5
Tip Style	RS-Style Oval
Tube Connection	Butt Joint
Tube Diameter	3.5
Tube Diameter	2.75
Tube Diameter	3
Tube Finish	Brushed
Valve Actuation	OEM
Valves	Yes
Warning	California Proposition 65
Welding	TIG
Description_INV	B9 RS5 CAT-BACK KIT
Description_DES	APR Catback Exhaust System - RS4 / RS5 (B9)
Description_EXT	Fits Audi RS4 18-25, RS5 18-25
Description_MKT	Introducing the APR Catback Exhaust System for the Audi B9 RS4 and RS5
Description_MKT	The APR Catback Exhaust System for the Audi B9 RS4 and RS5 is a complete, high-performance exhaust solution that runs the entire length of the vehicle from the catalyst back. This system is engineered to boost performance, elevate sound, and enhance aesthetics with RS-style diamond black oval exhaust tips that are sure to make a statement. Crafted from premium materials and built with advanced manufacturing techniques, this system is designed to withstand harsh conditions and deliver lasting performance. Expect a bold, aggressive growl at wide-open throttle, along with an impressive gain of 9 horsepower and 15 FT-LBS of torque to all four wheels!
Description_MKT	Unmatched Design and Precision Engineering
Description_MKT	Unlike anything currently available, the APR system includes downpipes extending to the factory catalyst in the upper engine bay, making this a true full-system upgrade. We’ve minimized restrictions with smooth transitions, oversized piping, and straight-through mufflers and resonators. Constructed from mandrel-bent T304 stainless steel with a brushed finish and TIG welding throughout, this exhaust system is as durable as it is striking. Installation is hassle-free, thanks to precision-fit brackets, OEM-style slip clamps, and an included upgraded tunnel brace to accommodate the oversized piping.
Description_MKT	Inspired by RS Performance
Description_MKT	Like the RS4 and RS5, this system stays with the unique single oversized midpipe design. It utilizes dual 2.75” (70mm) downpipes and midpipes that merge through a cast Y-junction into a massive 3.5” (91mm) midpipe. The integrated Helmholtz resonator minimizes drone through a straight-through design with a sound-canceling port, ensuring no compromise in exhaust flow.
Description_MKT	The system splits again via another cast Y into two rear, valve-controlled mufflers with sound absorption technology. These valves are fully integrated with the OEM control system, adjusting automatically to enhance sound during aggressive driving while maintaining a quieter profile during cruising. Finally, exhaust gases exit through dual cast Y-junctions into a quad 2.5” (63.5mm) system, terminating via oversized 7.25”x5” RS-style exhaust tips. The tips feature a diamond black finish and a subtle APR logo for a refined touch.
Description_MKT	Experience the APR Difference
Description_MKT	Designed for enthusiasts seeking the perfect balance of power, sound, style, and quality, the APR Catback Exhaust System for the Audi B9 RS4 and RS5 is a testament to engineering excellence. With its performance-driven design and durable construction, this system not only transforms your driving experience but also ensures years of reliable performance.
Description_FAB	Complete catalyst-back system including downpipes, extending from the factory catalyst back.
Description_FAB	Performance gains of 9 HP and 15 FT-LBS of torque delivered to all four wheels.
Description_FAB	Premium T304 stainless steel construction with TIG welding for strength and durability.
Description_FAB	Optimized flow through dual 2.75” downpipes, 3.5” midpipe, and quad 2.5” exits.
Description_FAB	Mandrel-bent brushed piping paired with electropolished cast splitters for a refined finish.
Description_FAB	Precision brackets and slip clamps ensure accurate alignment and hassle-free installation.
Description_FAB	Includes an upgraded tunnel brace to accommodate the larger piping.
Description_FAB	Integrated Helmholtz resonator minimizes drone and enhances sound quality.
Description_FAB	Valve-controlled rear mufflers dynamically adjust sound based on driving style.
Description_FAB	Dual 7.25”x5” RS-style diamond black oval tips with APR logo.
Description_FAB	Smooth transitions and straight-through components maximize performance by reducing restrictions.
Description_FAB	Strikes the perfect balance of power, sound, style, and quality for enthusiasts.
Description_FAB	Fully emissions compliant for worry-free operation.