{"product_id":"cbk0037","title":"APR Catback Exhaust System - RS4 \/ RS5 (B9)","description":"\u003cdiv class=\"billy_features_content\"\u003e\n  \u003ch3\u003eOverview\u003c\/h3\u003e\n  \u003cdiv\u003e\n    \u003cp\u003ePLEASE 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. | Introducing the APR Catback Exhaust System for the Audi B9 RS4 and RS5 | 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! | Unmatched Design and Precision Engineering | 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. | Inspired by RS Performance | 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. | 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. | Experience the APR Difference | 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.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003chr\u003e\n  \u003ch3\u003eFeatures\u003c\/h3\u003e\n  \u003cdiv\u003e\n    \u003cul\u003e\n      \u003cli\u003eComplete catalyst-back system including downpipes, extending from the factory catalyst back.\u003c\/li\u003e\n      \u003cli\u003ePerformance gains of 9 HP and 15 FT-LBS of torque delivered to all four wheels.\u003c\/li\u003e\n      \u003cli\u003ePremium T304 stainless steel construction with TIG welding for strength and durability.\u003c\/li\u003e\n      \u003cli\u003eOptimized flow through dual 2.75” downpipes, 3.5” midpipe, and quad 2.5” exits.\u003c\/li\u003e\n      \u003cli\u003eMandrel-bent brushed piping paired with electropolished cast splitters for a refined finish.\u003c\/li\u003e\n      \u003cli\u003ePrecision brackets and slip clamps ensure accurate alignment and hassle-free installation.\u003c\/li\u003e\n      \u003cli\u003eIncludes an upgraded tunnel brace to accommodate the larger piping.\u003c\/li\u003e\n      \u003cli\u003eIntegrated Helmholtz resonator minimizes drone and enhances sound quality.\u003c\/li\u003e\n      \u003cli\u003eValve-controlled rear mufflers dynamically adjust sound based on driving style.\u003c\/li\u003e\n      \u003cli\u003eDual 7.25”x5” RS-style diamond black oval tips with APR logo.\u003c\/li\u003e\n      \u003cli\u003eSmooth transitions and straight-through components maximize performance by reducing restrictions.\u003c\/li\u003e\n      \u003cli\u003eStrikes the perfect balance of power, sound, style, and quality for enthusiasts.\u003c\/li\u003e\n      \u003cli\u003eFully emissions compliant for worry-free operation.\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"APR","offers":[{"title":"Default Title","offer_id":53148703129894,"sku":"CBK0037","price":2131.66,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1666\/1542\/files\/hjqf_CBK0037_01_P04_KIT_7bba713a-542a-4b72-aa89-a29a6cbb7ed9.jpg?v=1778101414","url":"https:\/\/billysspeedshop.com\/fr\/products\/cbk0037","provider":"Billys Speed Shop","version":"1.0","type":"link"}