{"product_id":"stone-exhaust-bmw-b48-f30-f32-cat-back-valvetronic-exhaust-inc-330i-430i","title":"Stone Exhaust BMW 3 \u0026 4 Series B48 (F30 F31 F32 F33 F36) Valved OEM-Integrated Cat-Back Exhaust | 330i 430i 420i 330e | Twin or Quad Tailpipes","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eStone Exhaust switchable cat-back for BMW F30 F31 F32 F33 F36 B48\u003c\/h2\u003e\n  \u003cp\u003eTransform the sound and response of your turbocharged BMW 3 Series and 4 Series with a premium cat-back designed around factory data for an exact fit. This Stone Exhaust system features factory valve integration for effortless mode control, a deep, sporty soundtrack without drone on the motorway, and dyno-developed flow for crisp throttle feel. Ideal for drivers looking for a refined daily and a truly exciting tone when you want it.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat makes it stand out\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFactory valve integration for seamless ECU-controlled operation\u003c\/li\u003e\n    \u003cli\u003eQuiet when cruising and assertive under load with no cabin boom\u003c\/li\u003e\n    \u003cli\u003eDeveloped using OEM 3D scans for precise, direct-fit installation\u003c\/li\u003e\n    \u003cli\u003eDyno-developed for improved gas flow and response\u003c\/li\u003e\n    \u003cli\u003e7-axis CNC bending and precision mechanical welding for accuracy and durability\u003c\/li\u003e\n    \u003cli\u003eOne-piece section design for strength and consistent alignment\u003c\/li\u003e\n    \u003cli\u003eChoice of twin exit or quad exit tailpipes\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eLayouts and part numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eAP512B48 dual exit with twin tailpipes\u003c\/li\u003e\n    \u003cli\u003eAP512QB48 dual exit with quad tailpipes\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eCompatible BMW models with the B48 engine\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003e3 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF30 LCI and F31 LCI 330i and 330i xDrive 2014 to 2018\u003c\/li\u003e\n    \u003cli\u003eF30 LCI and F31 LCI 330e 2014 to 2018\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003e4 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF32 420i and 420i xDrive 2015+\u003c\/li\u003e\n    \u003cli\u003eF32 LCI 420i and 420i xDrive 2016+\u003c\/li\u003e\n    \u003cli\u003eF33 420i and 420i xDrive 2015+\u003c\/li\u003e\n    \u003cli\u003eF33 LCI 420i and 420i xDrive 2016+\u003c\/li\u003e\n    \u003cli\u003eF36 420i and 420i xDrive 2015+\u003c\/li\u003e\n    \u003cli\u003eF36 LCI 420i and 420i xDrive 2016+\u003c\/li\u003e\n    \u003cli\u003eF32 F33 F36 430i and 430i xDrive\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eValve control options\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eStandard: factory valve control via the vehicle ECU\u003c\/li\u003e\n    \u003cli\u003eOptional: Stone Valvetronic single-valve kit with remote and plug-and-play OBDII controller\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eR and D and build quality\u003c\/h3\u003e\n  \u003cp\u003eUsing OEM 3D scanning, Stone maps routing, diameters and bend angles to mirror factory geometry. Flow, temperature and pressure simulations inform the design before production with 7-axis CNC bending to preserve roundness and maintain smooth gas velocity. Crisscross and overlapping weld techniques plus direct spot welding yield strength, precision and long-term reliability.\u003c\/p\u003e\n\n  \u003ch3\u003eRoad-tested by us\u003c\/h3\u003e\n  \u003cp\u003eWe have installed these systems for customers and the feedback has been consistently positive. Fitment is spot on, the finish is excellent and the soundtrack is exactly what enthusiasts want: calm on the commute, purposeful when pressing on. It is a proven upgrade for F30 F31 F32 F33 F36 B48 owners.\u003c\/p\u003e\n\n  \u003ch3\u003eHear it\u003c\/h3\u003e\n  \u003cp\u003e\n    \u003ciframe width=\"854\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/VSgvyGxd3ic\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/p\u003e\n\n  \u003ch3\u003eInstallation and support\u003c\/h3\u003e\n  \u003cp\u003eProfessional fitting available at MJ Modifications in Warwickshire. For a quote or advice, email \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e. UK delivery available.\u003c\/p\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003e2-year Stone Exhaust warranty.\u003c\/p\u003e\n\n  \u003ch3\u003eSearch-friendly terms\u003c\/h3\u003e\n  \u003cp\u003eBMW F30 330i performance exhaust, BMW F31 Touring sports system, BMW F32 430i quad exit, BMW F33 convertible twin exit, BMW F36 Gran Coupe cat back, B48 switchable exhaust, BMW 420i sports exhaust UK, BMW 330e hybrid cat back, F30 LCI active valve exhaust, BMW 3 Series sound upgrade, BMW 4 Series rear system, BMW xDrive 430i exhaust upgrade, BMW 330i twin tailpipes, BMW 430i four tailpipes, BMW B48 valve-controlled exhaust, BMW F3x cat back UK, Warwickshire BMW exhaust fitting, plug-and-play valve controller BMW, F31 estate performance exhaust, F32 coupe sports exhaust.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"OME Integrated Valve(s) \/ Dual Exit with Twin Tailpipes \/ Require Original Bumper \/ Flat Cut Gloss Carbon Fibre (82mm)","offer_id":56008687452546,"sku":null,"price":2396.16,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/8200CG_FlatCutGlossCarbonFiber82mmExhuastTailpipes_1024x1024_2_1024x1024_2x_1815196f-123c-497a-8fd1-f938b30d32df.webp?v=1764090754","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-b48-f30-f32-cat-back-valvetronic-exhaust-inc-330i-430i","provider":"MJ Modifications","version":"1.0","type":"link"}