HJQF CBK0037 APR Catback Exhaust System - RS4 / RS5 (B9) - Fits 2018-2025 Audi RS5, RS5 Sportback

Fits Audi RS4 18-25, RS5 18-25

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.; Experience the APR Difference; Inspired by RS Performance; Introducing the APR Catback Exhaust System for the Audi B9 RS4 and RS5; 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.; PLEASE NOTE* Some B9.5 vehicles will come equipped with an update valve motor. If you have a valve actuator with part number 8S0-133-246-D please call us at 1 (800) 680-7921 and request adapter EXH0712. We will expedite an adapter at no charge with proof of purchase.; 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!; 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.; 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.; Unmatched Design and Precision Engineering

Features and Benefits: Complete catalyst-back system including downpipes, extending from the factory catalyst back.; Dual 7.25”x5” RS-style diamond black oval tips with APR logo.; Fully emissions compliant for worry-free operation.; Includes an upgraded tunnel brace to accommodate the larger piping.; Integrated Helmholtz resonator minimizes drone and enhances sound quality.; Mandrel-bent brushed piping paired with electropolished cast splitters for a refined finish.; Optimized flow through dual 2.75” downpipes, 3.5” midpipe, and quad 2.5” exits.; Performance gains of 9 HP and 15 FT-LBS of torque delivered to all four wheels.; Precision brackets and slip clamps ensure accurate alignment and hassle-free installation.; Premium T304 stainless steel construction with TIG welding for strength and durability.; Smooth transitions and straight-through components maximize performance by reducing restrictions.; Strikes the perfect balance of power, sound, style, and quality for enthusiasts.; Valve-controlled rear mufflers dynamically adjust sound based on driving style.