{"product_id":"milltek-resonated-cat-back-exhaust-for-audi-b9-s4-s5-burnt-titanium-tips-ssxau643","title":"Milltek Resonated Cat-Back Exhaust for Audi B9 S4 S5, Burnt Titanium Tips","description":"\u003cp\u003eMilltek 2.50\" Resonated Cat-Back Exhaust System for Audi B9 S4 and S5 (non-sport differential models). Direct factory fitment replacement using OEM hangers; no modification required. Mandrel-bent T304L stainless steel construction with hand-finished quad GT-100 burnt titanium trim tips.\u003c\/p\u003e\n\u003cp\u003eThe resonated design eliminates resonance peaks while preserving OE+ tone character across the rpm range. 63.50mm (2.50\") pipe diameter optimizes scavenging for the 3.0L turbo V6. CNC-formed internals tuned for the B9 platform's backpressure curve. Dyno-proven gains in mid-range torque delivery without sacrificing street usability.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi S4 3.0 Turbo V6 B9 Saloon\/Sedan and Avant - 2016 and later (non-sport differential models)\u003c\/li\u003e\n\u003cli\u003eAudi S5 3.0 Turbo V6 B9 Sportback - 2017 and later (non-sport differential models)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Hand-finished stainless construction resists thermal cycling and corrosion. Each system is decibel-tested to ensure compliance with street use while delivering engineered sound character. \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":60150588932382,"sku":"MILSSXAU643","price":4651.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXAU643_1.jpg?v=1791252716","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-resonated-cat-back-exhaust-for-audi-b9-s4-s5-burnt-titanium-tips-ssxau643","provider":"Signature Autohaus","version":"1.0","type":"link"}