{"product_id":"stone-exhaust-bmw-s55-f80-f82-opf-back-valvetronic-exhaust-system-m3-m4","title":"Stone Exhaust BMW S55 F80 F82 OPF-Back OEM Integrated Valved Exhaust System (M3 \u0026 M4)","description":"\u003ch4 class=\"unreset\"\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp class=\"unreset\"\u003eWe are proud to introduce you to the state of the art Stone Exhaust Valvetronic Cat-Back Exhaust System with dual valves, to enhance the performance and sound of your BMW F80 Sedan M3 \u0026amp; F82 Coupe M4 with the S55 engine.\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003eStone Exhaust has been developing world's best exhaust system since 1998, starting with 3D scanning and reverse engineering the OEM system, this allows the Stone engineers to design a 100% OEM fitment exhaust with precision. With their in-house dyno, your BMW exhaust system is proven to produce more power with the enhanced Stone signature exhaust sound.\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003eThe OEM Integred Valves option allows your exhuast system to operate as standard, where the onboard computer (ECU) will control the opening and closing of the valves automatically.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e \u003c\/p\u003e\n\u003cp class=\"unreset\"\u003eThis Exhaust System is often purchased with the\u003cb\u003e \u003ca href=\"\/products\/stone-exhaust-bmw-s55-f80-f82-f87-catless-downpipe-m2-competition-m3-m4?_pos=2\u0026amp;_sid=819e6e84e\u0026amp;_ss=r\" title=\"Stone Exhaust BMW S55 F80 F82 F87 Catless Downpipe (M2 Competition, M3 \u0026amp; M4)\" target=\"_blank\"\u003e\u003cspan\u003eStone Exhaust BMW S55 F80 F82 F87 Catless Downpipe (M2 Competition, M3 \u0026amp; M4)\u003c\/span\u003e\u003c\/a\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eYou may wish to add the \u003c\/span\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003ca style=\"color: #2b00ff;\" href=\"\/products\/stone-cat-back-valvetronic-system-package\" target=\"_blank\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eStone Valvetronic System\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e (Dual Valves)\u003cspan data-mce-fragment=\"1\"\u003e which enables you to control the valves remotely via the stone remote controller\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eOEM Integrated OPF-Back Exhaust System\u003c\/li\u003e\n\u003cli\u003eOptional Stone Valvetronic System available\u003c\/li\u003e\n\u003cli\u003ePlug and Play OBDII controller\u003c\/li\u003e\n\u003cli\u003eOne Piece Design\u003c\/li\u003e\n\u003cli\u003eMachine Welding\u003c\/li\u003e\n\u003cli\u003eIn House Research and Development\u003c\/li\u003e\n\u003cli\u003e3D Scanning \u0026amp; Reverse Engineering\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDyno Developed In House\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan mce-data-marked=\"1\"\u003eEliminates drone found on the standard exhaust system\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"unreset\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eS55 Engine\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBMW M Series\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eF80 M3 \u003cspan data-mce-fragment=\"1\"\u003eSaloon\u003c\/span\u003e (2012-2015)\u003c\/li\u003e\n\u003cli\u003eF80 LCI M3 \u003cspan data-mce-fragment=\"1\"\u003eSaloon\u003c\/span\u003e (2015-2018)\u003c\/li\u003e\n\u003cli\u003eF82 M4 Coupe (2013-2017)\u003c\/li\u003e\n\u003cli\u003eF82 LCI M4 \u003cspan data-mce-fragment=\"1\"\u003eCoupe \u003c\/span\u003e(2016-2018)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003ePerformance Gains\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp class=\"unreset\"\u003e\u003cstrong\u003eDyno Result\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cstrong\u003e\u003cimg alt=\"Stone Exhaust BMW S55 F80 M3 \u0026amp; F82 M4 Cat-Back Valvetronic Exhaust System | Stone Exhaust USA\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/M3_DP_Cack123.jpg6_600x600.png?v=1589168396\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1272\/9301\/files\/StoneExhaustBMWS55F80F82OPF-BackOEMIntegratedValvedExhaustSystem_M3_M4_-graph_2048x2048.jpg?v=1674030284\" target=\"_blank\" title=\"Stone Exhaust BMW S55 F80 F82 OPF-Back OEM Integrated Valved Exhaust System (M3 \u0026amp; M4)\" rel=\"noopener noreferrer\"\u003e\u003cimg alt=\"Stone Exhaust BMW S55 F80 F82 OPF-Back OEM Integrated Valved Exhaust System (M3 \u0026amp; M4) - ML Performance US\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1272\/9301\/files\/StoneExhaustBMWS55F80F82OPF-BackOEMIntegratedValvedExhaustSystem_M3_M4_-graph_2048x2048.jpg?v=1674030284\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e \u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cstrong\u003ePower Gain\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"scrollable-wrapper\"\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr class=\"content-list\"\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"title\"\u003ePOWER\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"symbol\"\u003e+\u003c\/span\u003e12.2PS \u003cbr\u003eat\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"num2\"\u003e6800\u003c\/span\u003erpm\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003e\u003cspan class=\"title\"\u003eTORQUE\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"symbol\"\u003e+9.8nm \/ 7.2ft-lb of torque\u003c\/span\u003e\u003cbr\u003eat\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"num2\"\u003e2500\u003c\/span\u003erpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp class=\"unreset\"\u003e \u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003eR\u0026amp;D and 3D Scanning\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003eStone Exhaust engineers use reverse engineering by 3D scanning OEM parts to understand their functionality and identify weaknesses. Data has been collected continuously in order to analyze factors such as pipe diameter, route and degrees of the bending angles of the Exhaust System found on the BMW S55 F80 M3 and F82 M4.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003eDuring R\u0026amp;D, Stone Exhaust utilizes the 3D simulation software to stimulate the exhaust gas flow movement, thermal and pressure rise zone. Progressive improvements were continually made until the optimal performance was achieved.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\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 System 3D Scanning Reverse Engineering - ML Performance US\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e7 Axis CNC Bending Machine\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eStone Exhaust System are constructed utilizing a 7 axis CNC Bending Machine which is the ultimate machine for high levels of precision delivery, necessary for industries such as the aerospace and defense industries.\u003c\/span\u003e\u003c\/p\u003e\n\u003col\u003e\u003c\/ol\u003e\n\u003cp\u003eWith the state-of-the-art bending machine, Stone Exhaust has achieved the industry’s standard to an impressive 98% roundness, whilst maintaining the wear of the outer bore at only 25% at 180\u003cstrong\u003e°\u003c\/strong\u003e. Airflow obstruction and welding fracture problems are prevented by utilizing this technology. With the combination of the CNC Bending machine, Reverse Engineering and 3D Design Scanning, Stone exhaust has created an integrally molded exhaust pipe with an accuracy error under 0.025mm.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\" alt=\"Stone Exhaust System Bending - ML Performance US\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCrisscross and Overlapping Welding Technique\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe flange between the turbo and the downpipes reaches extreme temperatures (800? to 1100?) which creates stress on the connection point. By utilizing both welding techniques to increases the width and penetration of welds. This increases the endurance and tolerance of these connection points, leading to quality products with reliable performance.\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\u003e\u003cimg style=\"float: none;\" height=\"1024x1024\" width=\"1024x1024\" alt=\"Stone Exhaust Art of Welding - ML Performance US\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_1_1024x1024.jpg?v=1572828150\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDirect Spot Welding\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOur highly skilled engineers perform direct spot welding to increase product strength. This is undertaken by mechanical welding arms, proven to achieve greater precision and penetration in their welds compared to manual welding, resulting in an end product that is a work of art.\u003c\/p\u003e\n\u003cdiv style=\"text-align: start;\"\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 Art of Welding - ML Performance US\" style=\"float: none;\"\u003e \u003c\/div\u003e\n\u003cp\u003e  \u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eAP507-OPFBack\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eMore Information\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eManufactured by\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eStone Exhaust\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003eStone Exhaust 2 Year Warranty\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003ePhotos \u0026amp; Videos\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp class=\"unreset\"\u003e\u003cstrong\u003eDual Exit with Quad Tailpipes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/DSC04744use_600x600.png?v=1589168055\" alt=\"Stone Exhaust BMW S55 F80 M3 \u0026amp; F82 M4 Cat-Back Valvetronic Exhaust System | Stone Exhaust USA\"\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/DSC04748use_600x600.png?v=1589168079\" alt=\"Stone Exhaust BMW S55 F80 M3 \u0026amp; F82 M4 Cat-Back Valvetronic Exhaust System | Stone Exhaust USA\"\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e   \u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/DSC04721use_600x600.png?v=1589168185\" alt=\"Stone Exhaust BMW S55 F80 M3 \u0026amp; F82 M4 Cat-Back Valvetronic Exhaust System | Stone Exhaust USA\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e \u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003eFlat Cut Matte Carbon Fiber\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/cLHAMuca5Gk\" height=\"720\" width=\"1280\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1272\/9301\/files\/STONE_EXHAUST_BMW_S55_F80_F82_OPF-BACK_VALVETRONIC_EXHAUST_SYSTEM_M3_M4_-2_2048x2048.jpg?v=1644889420\" alt=\"\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1272\/9301\/files\/STONE_EXHAUST_BMW_S55_F80_F82_OPF-BACK_VALVETRONIC_EXHAUST_SYSTEM_M3_M4_-1_2048x2048.jpg?v=1644889441\" alt=\"\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1272\/9301\/files\/STONE_EXHAUST_BMW_S55_F80_F82_OPF-BACK_VALVETRONIC_EXHAUST_SYSTEM_M3_M4_-4_2048x2048.jpg?v=1644889484\" alt=\"\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"unreset\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1272\/9301\/files\/STONE_EXHAUST_BMW_S55_F80_F82_OPF-BACK_VALVETRONIC_EXHAUST_SYSTEM_M3_M4_-3_2048x2048.jpg?v=1644889503\" alt=\"\"\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStone Exhaust M3 \u0026amp; M4 Catless Downpipe with Stone Valvetronic Exhaust System Sound\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ciframe title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/3TDiAsHfG0U\" height=\"315\" width=\"560\" allowfullscreen=\"\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" frameborder=\"0\"\u003e\u003c\/iframe\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"Stone Exhaust","offers":[{"title":"Flat Cut Gloss Carbon Fiber (82mm)","offer_id":48679166869729,"sku":"AP507-OPFBack-8200CG","price":4667.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/7608\/4961\/files\/STONEEXHAUSTBMWS55F80F82CAT-BACKEXHAUSTSYSTEM_M3_M4__01_1ac7094a-6f0e-45c0-8d35-95731a2997a7.jpg?v=1784823096","url":"https:\/\/mlperformanceusa.com\/products\/stone-exhaust-bmw-s55-f80-f82-opf-back-valvetronic-exhaust-system-m3-m4","provider":"ML Performance USA","version":"1.0","type":"link"}