{"product_id":"stainless-valved-catback-exhaust-system-for-audi-b9-s4-s5","title":"Stainless Valved Catback Exhaust System for Audi B9 S4 S5","description":"\u003cp data-start=\"323\" data-end=\"646\"\u003eThe \u003cstrong data-start=\"327\" data-end=\"348\"\u003eAudi B9 S4 and S5\u003c\/strong\u003e, powered by the \u003cstrong data-start=\"365\" data-end=\"382\"\u003eEA839 3.0L V6\u003c\/strong\u003e, offer strong performance from the factory—but the stock exhaust limits the engine’s true sound and character. The \u003cstrong data-start=\"498\" data-end=\"531\"\u003eSTRATEC Valved Exhaust System\u003c\/strong\u003e unlocks a more aggressive, performance-driven exhaust tone while retaining refined, OEM-like manners when desired.\u003c\/p\u003e\n\u003cp data-start=\"648\" data-end=\"919\"\u003eEngineered as a \u003cstrong data-start=\"664\" data-end=\"702\"\u003ecomplete, one-piece exhaust system\u003c\/strong\u003e, this setup runs from the \u003cstrong data-start=\"729\" data-end=\"772\"\u003edownpipe connection to the exhaust tips\u003c\/strong\u003e, eliminating the need to mix components from multiple suppliers. The result is consistent sound quality, proper fitment, and seamless performance.\u003c\/p\u003e\n\u003cp data-start=\"921\" data-end=\"1173\"\u003eWith valves open, expect a bold, motorsport-inspired exhaust note with pronounced overrun crackles. With valves closed, the system returns to a quiet, refined tone suitable for daily driving—without unwanted drone when paired with the factory downpipe.\u003c\/p\u003e\n\u003chr data-start=\"1175\" data-end=\"1178\"\u003e\n\u003ch3 data-start=\"1180\" data-end=\"1196\"\u003eWhy It Works\u003c\/h3\u003e\n\u003cul data-start=\"1197\" data-end=\"1450\"\u003e\n\u003cli data-start=\"1197\" data-end=\"1269\"\u003e\n\u003cp data-start=\"1199\" data-end=\"1269\"\u003e\u003cstrong data-start=\"1199\" data-end=\"1229\"\u003eComplete One-Piece System:\u003c\/strong\u003e No mixing of axle-backs or resonators\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1270\" data-end=\"1357\"\u003e\n\u003cp data-start=\"1272\" data-end=\"1357\"\u003e\u003cstrong data-start=\"1272\" data-end=\"1301\"\u003eElectronic Valve Control:\u003c\/strong\u003e Instantly switch between aggressive and refined sound\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1358\" data-end=\"1450\"\u003e\n\u003cp data-start=\"1360\" data-end=\"1450\"\u003e\u003cstrong data-start=\"1360\" data-end=\"1384\"\u003eMandrel-Bent Design:\u003c\/strong\u003e Optimized exhaust flow for improved throttle response and power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1452\" data-end=\"1455\"\u003e\n\u003ch3 data-start=\"1457\" data-end=\"1476\"\u003eSound \u0026amp; Control\u003c\/h3\u003e\n\u003cul data-start=\"1477\" data-end=\"1685\"\u003e\n\u003cli data-start=\"1477\" data-end=\"1561\"\u003e\n\u003cp data-start=\"1479\" data-end=\"1561\"\u003e\u003cstrong data-start=\"1479\" data-end=\"1495\"\u003eValves Open:\u003c\/strong\u003e Aggressive tone with strong midrange and sharp overrun crackles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1562\" data-end=\"1631\"\u003e\n\u003cp data-start=\"1564\" data-end=\"1631\"\u003e\u003cstrong data-start=\"1564\" data-end=\"1582\"\u003eValves Closed:\u003c\/strong\u003e Quiet, refined, and OEM-like for daily driving\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1632\" data-end=\"1685\"\u003e\n\u003cp data-start=\"1634\" data-end=\"1685\"\u003e\u003cstrong data-start=\"1634\" data-end=\"1647\"\u003eNo Drone:\u003c\/strong\u003e When used with the factory downpipe\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1687\" data-end=\"1690\"\u003e\n\u003ch3 data-start=\"1692\" data-end=\"1718\"\u003eConstruction \u0026amp; Details\u003c\/h3\u003e\n\u003cul data-start=\"1719\" data-end=\"2008\"\u003e\n\u003cli data-start=\"1719\" data-end=\"1779\"\u003e\n\u003cp data-start=\"1721\" data-end=\"1779\"\u003e\u003cstrong data-start=\"1721\" data-end=\"1734\"\u003eMaterial:\u003c\/strong\u003e Full \u003cstrong data-start=\"1740\" data-end=\"1764\"\u003eT304 stainless steel\u003c\/strong\u003e construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1780\" data-end=\"1853\"\u003e\n\u003cp data-start=\"1782\" data-end=\"1853\"\u003e\u003cstrong data-start=\"1782\" data-end=\"1801\"\u003eWeight Savings:\u003c\/strong\u003e Approx. \u003cstrong data-start=\"1810\" data-end=\"1830\"\u003e16.4 lbs lighter\u003c\/strong\u003e than factory exhaust\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1854\" data-end=\"1923\"\u003e\n\u003cp data-start=\"1856\" data-end=\"1923\"\u003e\u003cstrong data-start=\"1856\" data-end=\"1874\"\u003eCraftsmanship:\u003c\/strong\u003e Precision TIG welding and smooth mandrel bends\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1924\" data-end=\"2008\"\u003e\n\u003cp data-start=\"1926\" data-end=\"2008\"\u003e\u003cstrong data-start=\"1926\" data-end=\"1943\"\u003eExhaust Tips:\u003c\/strong\u003e Includes premium tips for a clean, performance-oriented finish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2010\" data-end=\"2013\"\u003e\n\u003ch3 data-start=\"2015\" data-end=\"2034\"\u003eVehicle Fitment\u003c\/h3\u003e\n\u003cul data-start=\"2035\" data-end=\"2096\"\u003e\n\u003cli data-start=\"2035\" data-end=\"2065\"\u003e\n\u003cp data-start=\"2037\" data-end=\"2065\"\u003e\u003cstrong data-start=\"2037\" data-end=\"2063\"\u003e2017–2024 Audi S4 (B9)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2066\" data-end=\"2096\"\u003e\n\u003cp data-start=\"2068\" data-end=\"2096\"\u003e\u003cstrong data-start=\"2068\" data-end=\"2094\"\u003e2018–2024 Audi S5 (B9)\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bull Boost Performance","offers":[{"title":"Default Title","offer_id":42460947152981,"sku":"721814382440","price":1999.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0947\/5040\/files\/304BLACK_6ebcf044-bce1-4885-9209-beaf0c2be076.jpg?v=1777821152","url":"https:\/\/speedzone-web.com\/products\/stainless-valved-catback-exhaust-system-for-audi-b9-s4-s5","provider":"Speedzone Performance LLC","version":"1.0","type":"link"}