{"product_id":"apr-18-25-audi-s4-s5-b9-catback-exhaust-system","title":"APR 18-25 Audi S4\/S5 (B9) Catback Exhaust System","description":"\u003cp\u003eThe APR Catback Exhaust System for the Audi B9 S4 and S5 is a complete, high-performance exhaust solution that runs the entire length of the vehicle from the catalyst back. Inspired by the larger center-pipe design of the higher-output RS4 and RS5 models, this system is engineered to boost performance, elevate sound, and enhance aesthetics with customizable 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 10 horsepower and 12 FT-LBS of torque to all four wheels!\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSmooth transitions and straight-through components maximize performance by reducing restrictions.\u003c\/li\u003e\n\u003cli\u003eRemovable quad 3.5” motorsport-style polished tips with APR logo; optional styles available.\u003c\/li\u003e\n\u003cli\u003eComplete catalyst-back system including downpipes, extending from the factory catalyst back.\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\u003ePremium T304 stainless steel construction with TIG welding for strength and durability.\u003c\/li\u003e\n\u003cli\u003eOptimized flow through dual 2.5” downpipes, 2.75” midpipes, and a 3.5” midpipe.\u003c\/li\u003e\n\u003cli\u003eStrikes the perfect balance of power, sound, style, and quality for enthusiasts.\u003c\/li\u003e\n\u003cli\u003ePerformance gains of 10 HP and 12 FT-LBS of torque delivered to all four wheels.\u003c\/li\u003e\n\u003cli\u003eValve-controlled rear mufflers dynamically adjust sound based on driving style.\u003c\/li\u003e\n\u003cli\u003eIntegrated Helmholtz resonator minimizes drone and enhances sound quality.\u003c\/li\u003e\n\u003cli\u003eIncludes an upgraded tunnel brace to accommodate the larger piping.\u003c\/li\u003e\n\u003cli\u003eFully emissions compliant for worry-free operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis Part Fits:\u003c\/p\u003e\u003ctable border=\"1\"\u003e\n\u003ctr\u003e\n\u003cth align=\"left\" width=\"100\"\u003eYear\u003c\/th\u003e\n\u003cth align=\"left\" width=\"125\"\u003eMake\u003c\/th\u003e\n\u003cth align=\"left\" width=\"150\"\u003eModel\u003c\/th\u003e\n\u003cth align=\"left\" width=\"80\"\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2025\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003ePremium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2025\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003ePremium Plus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2025\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS4\u003c\/td\u003e\n\u003ctd\u003ePrestige\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2024\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS5\u003c\/td\u003e\n\u003ctd\u003ePremium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2024\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS5\u003c\/td\u003e\n\u003ctd\u003ePremium Plus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2024\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS5\u003c\/td\u003e\n\u003ctd\u003ePrestige\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2020-2025\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS5 Sportback\u003c\/td\u003e\n\u003ctd\u003ePremium\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2025\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS5 Sportback\u003c\/td\u003e\n\u003ctd\u003ePremium Plus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2025\u003c\/td\u003e\n\u003ctd\u003eAudi\u003c\/td\u003e\n\u003ctd\u003eS5 Sportback\u003c\/td\u003e\n\u003ctd\u003ePrestige\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"APR","offers":[{"title":"Default Title","offer_id":45642991861939,"sku":"APRCBK0012","price":2669.26,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0635\/1831\/0579\/files\/f80e8b2848bfde50e3dd84eb32e71bdfL.jpg?v=1783129520","url":"https:\/\/www.standardautopart.com\/products\/apr-18-25-audi-s4-s5-b9-catback-exhaust-system","provider":"Standard Auto Part","version":"1.0","type":"link"}