{"product_id":"stone-exhaust-bmw-s55-f80-f82-cat-back-exhaust-system-m3-m4","title":"Stone Exhaust BMW M3\/M4 S55 F80 F82 Valved Performance Catback Exhaust - OEM Integrated Valve, ECU Controlled, No Drone - AP507","description":"\u003cdiv\u003e\n  \u003ch2\u003eStone Exhaust AP507 for BMW F80 M3 and F82 M4 S55\u003c\/h2\u003e\n\n  \u003cp\u003eTransform the soundtrack and response of your twin turbo S55 with the Stone Exhaust AP507 rear system. This flap controlled cat back keeps factory valve functionality through the ECU, gives a richer motorsport tone, and remains calm on the motorway with zero cabin boom. If you want a premium BMW M performance upgrade that fits like original equipment and sounds incredible without compromise, this is it.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat you will love\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFactory valve integration, uses the car’s original flap motors and drive modes for seamless operation\u003c\/li\u003e\n    \u003cli\u003eDeep, refined note at idle and cruise, aggressive and crisp under load with no drone\u003c\/li\u003e\n    \u003cli\u003eTrue bolt on fit, developed from full 3D scans of the OE layout for precise alignment\u003c\/li\u003e\n    \u003cli\u003eOne piece layout with machine perfect welds for strength and longevity\u003c\/li\u003e\n    \u003cli\u003eDyno proven gains for genuine performance you can feel\u003c\/li\u003e\n    \u003cli\u003eOptional Valvetronic controller available for remote valve control via simple OBD plug in\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eReal world results\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePower gain: +12.2 PS at 6800 rpm\u003c\/li\u003e\n    \u003cli\u003eTorque gain: +9.8 Nm and +7.2 ft lb at 2500 rpm\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eEngineering first approach\u003c\/h3\u003e\n  \u003cp\u003eStone engineers start by 3D scanning the original pipework to lock in routing and diameter. Flow is then refined using simulation to optimise gas speed and reduce back pressure. 7 axis CNC bending maintains up to 98 percent roundness through the bends for low turbulence. Critical joints use crisscross and overlapping welds for heat resistance, and automated spot welding ensures consistency across every AP507 system.\u003c\/p\u003e\n\n  \u003ch3\u003eOPF and GPF ready\u003c\/h3\u003e\n  \u003cp\u003eRunning a particulate filter car. Stone can include an OPF or GPF delete function free of charge, allowing installation on equipped vehicles without error messages. No ECU coding for the filter is required.\u003c\/p\u003e\n\n  \u003cdiv style=\"margin: 20px 0;\"\u003e\n    \u003cstrong\u003eHear it in action\u003c\/strong\u003e\n    \u003cdiv style=\"margin-top: 10px;\"\u003e\n      \u003ciframe width=\"100%\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/3TDiAsHfG0U\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003ePerfect pairings\u003c\/h3\u003e\n  \u003cp\u003eUnlock the full potential of the S55 by combining this cat back with the Stone S55 downpipes. Add the Stone Valvetronic controller for handheld valve operation in addition to the factory modes.\u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cp\u003eFor S55 powered BMW M models:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF80 M3 Saloon 2012 to 2015\u003c\/li\u003e\n    \u003cli\u003eF80 LCI M3 Saloon 2015 to 2018\u003c\/li\u003e\n    \u003cli\u003eF82 M4 Coupe 2013 to 2017\u003c\/li\u003e\n    \u003cli\u003eF82 LCI M4 Coupe 2016 to 2018\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRequired parts for installation\u003c\/h3\u003e\n  \u003cp\u003eYou will need the following additional items to complete the install:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003e2x Genuine BMW S55 downpipe gasket, exhaust side for M2 Competition, M3 and M4\u003c\/li\u003e\n    \u003cli\u003e4x Genuine BMW F10 F80 F87 G15 catalytic exhaust centre collar nut, M8 including M550iX, 760i, M850iX and M6\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eFitting\u003c\/h3\u003e\n  \u003cp\u003eWe recommend professional installation. Book with MJ Modifications in Warwickshire for expert fitting and setup. Request a quote by emailing info@mjmodifications.co.uk.\u003c\/p\u003e\n\n  \u003ch3\u003eWhy buy from us\u003c\/h3\u003e\n  \u003cp\u003eWe have installed this system on S55 cars and the feedback is consistently positive. Customers comment on the premium tone, the drone free cruise, the perfect fit and the noticeable improvement in response. It looks as good under the car as it sounds from the driver’s seat.\u003c\/p\u003e\n\n  \u003ch3\u003eManufacturer and warranty\u003c\/h3\u003e\n  \u003cp\u003eProduced by Stone Exhaust with a 2 year warranty.\u003c\/p\u003e\n\n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eAP507\u003c\/strong\u003e\u003c\/p\u003e\n\n  \u003ch3\u003eSearch terms customers use\u003c\/h3\u003e\n  \u003cp\u003eBMW F80 rear section, BMW F82 sports exhaust, S55 flap exhaust, M3 F80 back box upgrade, M4 F82 cat back system, BMW M twin turbo sound upgrade, ECU valve compatible exhaust, BMW M3 silencer upgrade, BMW M4 performance rear silencer, drone free BMW exhaust, UK BMW tuning parts, S55 mid pipe, premium BMW stainless rear system, track day friendly BMW exhaust tone, Comfort Sport Sport Plus valve control, BMW M sports back box, M3 M4 exhaust upgrade UK, high quality TIG welded exhaust, precise OEM fit performance system, OPF GPF compatible BMW exhaust.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Flat Cut Gloss Carbon Fiber (82mm)","offer_id":56008704262530,"sku":null,"price":3528.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/STONEEXHAUSTBMWS55F80F82CAT-BACKEXHAUSTSYSTEM_M3_M4__18_1946x_946edace-3c41-42ab-bca4-99e18bb7f3a6.jpg?v=1764091025","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-s55-f80-f82-cat-back-exhaust-system-m3-m4","provider":"MJ Modifications","version":"1.0","type":"link"}