{"product_id":"milltek-non-resonated-cat-back-exhaust-for-audi-b9-s4-s5-cerakote-black-tips-ssxau651","title":"Milltek Non-Resonated Cat-Back Exhaust for Audi B9 S4 S5, Cerakote Black Tips","description":"\u003cp\u003eMilltek 2.50\" Non-Resonated Cat-Back Exhaust System for Audi B9 S4 and S5 (non-sport differential models). Direct factory fitment replacement engineered to deliver increased exhaust flow, dyno-proven performance gains, and an aggressive engineered tone without resonance chambers.\u003c\/p\u003e\n\u003cp\u003eConstructed from T304L stainless steel, mandrel-bent throughout with hand-finished construction. The non-resonated design eliminates mid-range resonance to unlock full-throttle character while maintaining OEM+ fitment. Uses factory hangers and mounting points-no modification required.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 Saloon\/Sedan \u0026amp; Avant (non-sport differential only), 2016+\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 Turbo V6 B9 Sportback (non-sport differential only), 2017+\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Cat-back design: replaces rear silencer and tailpipes only. OEM cat and downpipe retained. For turbo-back coverage, see Milltek Turbo-Back systems. \u003c\/p\u003e\n\u003cp\u003eDesigned and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.\u003c\/p\u003e\n\u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n\u003cul class=\"fitment-list\"\u003e\n\u003cli\u003e2016 Audi S4 Base\u003c\/li\u003e\n\u003cli\u003e2016 Audi S4 Premium Plus\u003c\/li\u003e\n\u003cli\u003e2016 Audi S4 Prestige\u003c\/li\u003e\n\u003cli\u003e2017-2023 Audi S5 Base\u003c\/li\u003e\n\u003cli\u003e2018-2024 Audi S4 Base\u003c\/li\u003e\n\u003cli\u003e2018-2025 Audi S4 Premium Plus\u003c\/li\u003e\n\u003cli\u003e2018-2025 Audi S4 Prestige\u003c\/li\u003e\n\u003cli\u003e2018-2025 Audi S5 Premium Plus\u003c\/li\u003e\n\u003cli\u003e2018-2025 Audi S5 Prestige\u003c\/li\u003e\n\u003cli\u003e2019-2025 Audi S4 Premium\u003c\/li\u003e\n\u003cli\u003e2019-2025 Audi S5 Premium\u003c\/li\u003e\n\u003cli\u003e2026 Audi S4 Base\u003c\/li\u003e\n\u003cli\u003e2026 Audi S5 Base\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":60150595027230,"sku":"MILSSXAU651","price":3507.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXAU651_1.jpg?v=1791252781","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-non-resonated-cat-back-exhaust-for-audi-b9-s4-s5-cerakote-black-tips-ssxau651","provider":"Signature Autohaus","version":"1.0","type":"link"}