{"product_id":"milltek-80mm-large-bore-downpipe-hi-flow-sports-cat-for-audi-rs6-c8-ssxau909","title":"Milltek 80mm Large Bore Downpipe \u0026 Hi-Flow Sports Cat for Audi RS6 C8","description":"\u003cp\u003eThe Milltek 80mm Cat Back Large Bore Downpipe \u0026amp; Hi-Flow Sports Cat is a turbo-back component engineered for the Audi RS6 C8 (4.0L bi-turbo V8), Audi RS7 C8, and Audi S8 D5 (4.0L TFSI V8). This system optimizes exhaust flow downstream of the turbos and ahead of the cat-back system, unlocking measurable power gains and refined acoustic character.\u003c\/p\u003e\n\u003cp\u003eManufactured from T304L stainless steel with mandrel-bent piping (3.15\" \/ 80mm bore) and a high-flow sports catalytic converter (200 CPSI), the downpipe delivers direct factory fitment using OEM mounting points. The hi-flow cat maintains emissions compliance while reducing back pressure. Stage 2 ECU software is required to unlock full performance potential.\u003c\/p\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAudi RS6 C8 4.0L bi-turbo V8 (Performance Edition, 2020+)\u003c\/li\u003e\n\u003cli\u003eAudi RS7 C8 4.0L bi-turbo V8 (2019+)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0L TFSI V8 Standard Wheelbase (2020+)\u003c\/li\u003e\n\u003cli\u003eAudi S8 D5 4.0L TFSI V8 Long Wheelbase (2020+)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e Requires integration with OE or Milltek cat-back exhaust system. No OEM modifications necessary. \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\u003e2020-2026 Audi S8 Base\u003c\/li\u003e\n\u003cli\u003e2021-2025 Audi RS7 Sportback Base\u003c\/li\u003e\n\u003cli\u003e2021-2026 Audi RS6 Avant Performance\u003c\/li\u003e\n\u003cli\u003e2024-2026 Audi RS7 Sportback Performance\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":60150639296798,"sku":"MILSSXAU909","price":6486.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXAU909_1.jpg?v=1791253955","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-80mm-large-bore-downpipe-hi-flow-sports-cat-for-audi-rs6-c8-ssxau909","provider":"Signature Autohaus","version":"1.0","type":"link"}