{"product_id":"milltek-hjs-hi-flow-sports-cat-and-downpipe-for-audi-s4-b9-ssxau673","title":"Milltek HJS Hi-Flow Sports Cat and Downpipe for Audi S4 B9","description":"\u003ch3\u003eMilltek HJS Hi-Flow Sports Cat and Downpipe for the Audi S4 B9\u003c\/h3\u003e\u003cp\u003eEngineered as a direct replacement for the factory downpipe, mandrel-bent throughout to maintain flow and fitted to the OE mounting points.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePremium Materials: T304Lstainless steel for durability and lasting corrosion resistance.\u003c\/li\u003e\n\u003cli\u003eEnhanced Performance: 2.50\" (63.50mm) mandrel-bent pipework improves exhaust flow for sharper throttle response.\u003c\/li\u003e\n\u003cli\u003eDirect Fitment: engineered as a bolt-on replacement for the factory system.\u003c\/li\u003e\n\u003cli\u003eRace Use: intended for track and off-road use— check local regulations before road use.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePipe Diameter: 2.50\" (63.50mm)\u003c\/li\u003e\n\u003cli\u003eMaterial: T304L Stainless Steel\u003c\/li\u003e\n\u003cli\u003eSystem Type: HJS Hi-Flow Sports Cat and Downpipe\u003c\/li\u003e\n\u003cli\u003eFitting Time: 1.00 to 1.50 hours\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eCompatibility\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e2017 and later S5 3.0 V6 Turbo Sportback B9 (Non Sport Diff Models Only) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2017 and later S5 3.0 V6 Turbo Coupe\/Cabrio B9 (Non Sport Diff Models Only) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2017 and later S5 3.0 V6 Turbo Coupe Only B9 (Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2017 and later S5 3.0 V6 Turbo Sportback B9 (Sport Diff Models Only \u0026amp; without Brace Bars) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2017 and later S5 3.0 V6 Turbo Sportback B9 (Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2017 and later S5 3.0 V6 Turbo Coupe Only B9 (Sport Diff Models Only \u0026amp; WITH Brace Bars) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2016 and later S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003cli\u003e2016 and later S4 3.0 Turbo V6 B9 - Saloon\/Sedan \u0026amp; Avant (ONLY - Sport Diff Models Only \u0026amp; Without Brace Bars) - Left Hand Drive Cars Only\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eWhy Choose Milltek?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eEvery system is precision-built to deliver the sound, flow, and quality that define the Milltek difference.\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":60150600073502,"sku":"MILSSXAU673","price":3374.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXAU673_1.jpg?v=1791252929","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-hjs-hi-flow-sports-cat-and-downpipe-for-audi-s4-b9-ssxau673","provider":"Signature Autohaus","version":"1.0","type":"link"}