{"product_id":"milltek-resonated-cat-back-exhaust-for-audi-b9-s4-s5-brushed-titanium-tips-ssxau646-ssxau646","title":"Milltek Resonated Cat-Back Exhaust for Audi B9 S4 S5, Brushed Titanium Tips (SSXAU646)","description":"\u003cp\u003eMilltek Resonated Cat-Back Exhaust System for Audi B9 S4 and S5 (non-Sport Differential models). Direct factory fitment using OEM hangers, no modification required. 2.50\" (63.50mm) mandrel-bent T304L stainless steel construction with quad GT-90 titanium trim tips. Engineered to deliver dyno-proven flow gains while maintaining an OE+ sound character through precision resonance tuning.\u003c\/p\u003e\n\u003cp\u003eHand-finished T304L stainless steel throughout. CNC-formed resonance chambers eliminate drone while preserving full-throttle articulation. Uses factory mounting points and OEM valve compatibility for seamless integration. Decibel-tested and EC-approved for street and track use.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 Sedan \u0026amp; Avant (Non-Sport Diff) - 2016+\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 Turbo V6 B9 Sportback (Non-Sport Diff) - 2017+\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Dyno-tested and optimized for the B9 platform. \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":60150590669086,"sku":"MILSSXAU646","price":4403.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXAU646_1.jpg?v=1791252741","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-resonated-cat-back-exhaust-for-audi-b9-s4-s5-brushed-titanium-tips-ssxau646-ssxau646","provider":"Signature Autohaus","version":"1.0","type":"link"}