{"product_id":"stone-exhaust-bmw-s63-f90-m5-catless-downpipe","title":"Stone Exhaust Catless Downpipes for BMW M5\/M8 S63\/S63M (F90 F91 F92 F93) – High-Flow Turbo Decat, OPF \u0026 Non-OPF","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eStone Exhaust BMW S63M F90 F91 F92 F93 Catless Downpipes for M5 and M8\u003c\/h2\u003e\n  \u003cp\u003e\n    Upgrade your BMW M5 or BMW M8 with Stone Exhaust catless downpipes and unlock serious exhaust flow, response and sound. Engineered specifically for the BMW S63M twin turbo V8 in the F90 M5 and F91 F92 F93 M8, these catless downpipes are designed for enthusiasts who want maximum performance potential, sharper response and a more aggressive exhaust note from their M car. If you are searching for BMW M5 downpipe, BMW M8 downpipe, S63 downpipes, S63M catless downpipe, F90 M5 decat, F92 M8 decat, OPF downpipe or non OPF downpipe, this is the high quality solution that fits right and performs.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eWhy choose Stone Exhaust catless downpipes for your BMW M5 and M8\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eCatless downpipes purpose built for BMW M5 and BMW M8 with the S63M engine platform\u003c\/li\u003e\n    \u003cli\u003eOptimised exhaust gas flow using 3D flow velocity analysis to reduce restriction and back pressure\u003c\/li\u003e\n    \u003cli\u003eOne piece bend design to eliminate unnecessary welds in critical flow paths\u003c\/li\u003e\n    \u003cli\u003e100 percent OEM fitment for F90 M5 and F91 F92 F93 M8 chassis\u003c\/li\u003e\n    \u003cli\u003eMachine welded with mechanical welding arms for precision and clean internal welds\u003c\/li\u003e\n    \u003cli\u003eCrisscross and overlapping welding at the turbo flange to handle extreme heat and stress\u003c\/li\u003e\n    \u003cli\u003eIn house research and development, 3D scanning and reverse engineering of OEM parts\u003c\/li\u003e\n    \u003cli\u003eBuilt for reliability, durability and repeatable performance\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\n    We use these Stone Exhaust downpipes on customer cars and in our own builds. Fitment is spot on, quality is first class and feedback has been consistently brilliant. If you want a BMW M5 downpipe or BMW M8 downpipe that simply fits and delivers, this is the one.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eEngineered for flow and reliability\u003c\/h3\u003e\n  \u003cp\u003e\n    Stone Exhaust combines 3D simulation of exhaust gas flow, temperature and pressure with advanced manufacturing to maximise efficiency. The one piece bent pipe design reduces turbulence caused by multiple joints, improving exhaust velocity and helping the turbos breathe more freely. Results include reduced back pressure, stronger response and a more pronounced, motorsport inspired exhaust tone when paired with appropriate tuning.\n  \u003c\/p\u003e\n\n  \u003ch4\u003e7 axis CNC bending\u003c\/h4\u003e\n  \u003cp\u003e\n    Constructed on a 7 axis CNC bending machine for aerospace grade accuracy. Stone achieves an impressive 98 percent roundness with only 25 percent outer bore wear at 180 degrees. Combined with reverse engineering and 3D scans, the integrally moulded pipe achieves an accuracy error under 0.025 mm, helping avoid airflow obstruction and welding fracture issues common on lesser downpipes.\n  \u003c\/p\u003e\n\n  \u003ch4\u003eTurbo flange strength\u003c\/h4\u003e\n  \u003cp\u003e\n    The turbo to downpipe flange sees extreme temperatures. Stone uses crisscross and overlapping welding techniques to increase weld width and penetration at these critical points, improving endurance and long term reliability under repeated heat cycling.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eEngine:\u003c\/strong\u003e BMW S63M twin turbo V8\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eModels:\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eBMW F90 M5, M5 Competition, M5 CS\u003c\/li\u003e\n    \u003cli\u003eBMW F91 M8 Convertible\u003c\/li\u003e\n    \u003cli\u003eBMW F92 M8 Coupe\u003c\/li\u003e\n    \u003cli\u003eBMW F93 M8 Gran Coupe\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eOPF and non OPF options\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA221P\u003c\/strong\u003e - Non OPF\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eA221NPG\u003c\/strong\u003e - OPF\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eManufacturing details\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eOne piece design for smooth internal flow\u003c\/li\u003e\n    \u003cli\u003eMachine welded for precision and clean internal surfaces\u003c\/li\u003e\n    \u003cli\u003eDirect spot welding in key areas for strength\u003c\/li\u003e\n    \u003cli\u003eReverse engineered via 3D scanning for perfect OEM fitment\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/1_9336c8b0-c9ea-4822-891c-83490f630707.jpg?v=1572705528\" alt=\"Stone Exhaust 3D Scanning and Reverse Engineering for BMW S63M - Nforcd\" loading=\"lazy\"\u003e\n  \u003c\/p\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\" alt=\"Stone Exhaust 7 Axis CNC Bending for BMW M5 M8 Downpipes - Nforcd\" loading=\"lazy\"\u003e\n  \u003c\/p\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_1_1024x1024.jpg?v=1572828150\" alt=\"Stone Exhaust crisscross welding of turbo flange - Nforcd\" loading=\"lazy\"\u003e\n  \u003c\/p\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_2_1024x1024.jpg?v=1572828178\" alt=\"Stone Exhaust direct spot welding for strength - Nforcd\" loading=\"lazy\"\u003e\n  \u003c\/p\u003e\n\n  \u003ch3\u003eFitting and support\u003c\/h3\u003e\n  \u003cp\u003e\n    Professional installation recommended. We offer full fitting services at Nforcd in Warwickshire with in house expertise on the BMW S63M platform. For a tailored fitting quote, email \u003ca href=\"mailto:Sales@nforcd.com\"\u003eSales@nforcd.com\u003c\/a\u003e.\n  \u003c\/p\u003e\n\n  \u003ch3\u003ePart numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eA221P Non OPF\u003c\/li\u003e\n    \u003cli\u003eA221NPG OPF\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eManufacturer and warranty\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eManufactured by:\u003c\/strong\u003e Stone Exhaust\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e Stone Exhaust 2 year warranty\u003c\/p\u003e\n\n  \u003ch3\u003eBuy with confidence from Nforcd\u003c\/h3\u003e\n  \u003cp\u003e\n    Tried, tested and loved by our team and customers alike. Expect excellent OEM fitment, robust build quality and flow optimised design that gets the best from your S63M when combined with suitable software. Order your BMW M5 or BMW M8 catless downpipes today.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eCommon search terms\u003c\/h3\u003e\n  \u003cp\u003e\n    BMW M5 downpipe, BMW M8 downpipe, BMW M5 catless downpipe, BMW M8 catless downpipe, S63 downpipe, S63M downpipes, F90 M5 downpipe, F91 M8 downpipe, F92 M8 downpipe, F93 M8 downpipe, M5 Competition downpipe, M5 CS downpipe, M8 decat, BMW decat downpipes, OPF downpipe, non OPF downpipe, turbo downpipes BMW S63, Stone Exhaust downpipes UK, BMW M5 exhaust upgrade, BMW M8 exhaust upgrade, performance downpipes BMW.\n  \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Non-OPF","offer_id":42409658646716,"sku":null,"price":2030.4,"currency_code":"GBP","in_stock":true},{"title":"OPF","offer_id":42410073096380,"sku":null,"price":2030.4,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/9465\/6700\/products\/StoneExhaustBMWS63MF90F91F92F93CatlessDownpipe_M5_M8_1_1946x_449e6e75-a1a1-4beb-a60a-a7661729c036.jpg?v=1680602868","url":"https:\/\/www.nforcd.com\/products\/stone-exhaust-bmw-s63-f90-m5-catless-downpipe","provider":"Nforcd","version":"1.0","type":"link"}