{"product_id":"stone-exhaust-bmw-b48d-g20-g21-330i-cat-back-valvetronic-exhaust-system","title":"Stone Exhaust BMW 330i\/430i G20 G21 G22 G23 G26 (B46\/B46D\/B48D) OEM Valve-Integrated Valved OPF\/GPF Cat-Back Exhaust System","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eSwitchable Sports Exhaust for BMW G20 G21 G22 G23 G26 330i and 430i - B46, B46D, B48D - GPF friendly, factory-valve compatible\u003c\/h2\u003e\n  \n  \u003cp\u003eUnlock a richer tone, sharper response and everyday refinement on your G-series 3 Series and 4 Series with this Stone Exhaust performance system. Designed around the 2.0 turbo B46 and B48 family, this valve-controlled upgrade integrates with the original actuator for seamless drive-mode sound control. Developed with full 3D scanning for exact fit and dyno tested for real gains, it delivers the premium soundtrack and quality build our team and customers rave about.\u003c\/p\u003e\n  \n  \u003cp\u003eWe run Stone on our own cars and the feedback from owners is consistent: perfect fit, beautifully made, deep note when you want it and calm on the motorway with no annoying cabin boom.\u003c\/p\u003e\n  \n  \u003ch3\u003eHighlights - why enthusiasts choose this setup\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFactory valve compatible - retains the original flap and ECU control for Comfort, Sport and Sport Plus behaviour\u003c\/li\u003e\n    \u003cli\u003eGPF and OPF friendly layout - ideal for particulate filter equipped cars\u003c\/li\u003e\n    \u003cli\u003eOptional Stone Valvetronic add-on - remote control valve module with plug-and-play OBDII controller for sound on demand\u003c\/li\u003e\n    \u003cli\u003eDirect bolt-on fit - engineered from comprehensive 3D scans for a precise install with OEM alignment\u003c\/li\u003e\n    \u003cli\u003eDyno developed - refined flow path and acoustics for response you can feel\u003c\/li\u003e\n    \u003cli\u003eTuned to remove drone - relaxed cruising, aggressive character under load\u003c\/li\u003e\n    \u003cli\u003eOne-piece main section with precision machine welding for strength and consistency\u003c\/li\u003e\n    \u003cli\u003eAdvanced R and D - flow simulation, thermal analysis and geometry optimisation inform every bend\u003c\/li\u003e\n    \u003cli\u003e7 axis CNC bending - up to 98 percent roundness on tight radii to minimise turbulence\u003c\/li\u003e\n    \u003cli\u003eReinforced weld techniques at high stress zones for long term durability\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eHow it sounds and drives\u003c\/h3\u003e\n  \u003cp\u003eOn the B48 2.0T the tone is deeper and more characterful, with crisp valve transitions. Closed valve keeps things subtle for early starts and long trips. Open valve gives a stronger bark and a more engaging note without the harshness. The optimised routing helps the engine feel keener off the line and more eager through the revs.\u003c\/p\u003e\n  \n  \u003ch3\u003eOPF support plus OPF delete option\u003c\/h3\u003e\n  \u003cp\u003eSupplied in a configuration that works with OPF-equipped models. An OPF delete solution can be included free of charge, allowing installation on cars originally fitted with OPF without triggering warning lights, so no ECU coding is required.\u003c\/p\u003e\n  \n  \u003ch3\u003eVehicle compatibility - G-series 2.0 turbo petrol\u003c\/h3\u003e\n  \u003cp\u003eBMW 3 Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eG20 330i and 330i xDrive saloon\u003c\/li\u003e\n    \u003cli\u003eG21 330i and 330i xDrive Touring\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eBMW 4 Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eG22 430i and 430i xDrive coupe\u003c\/li\u003e\n    \u003cli\u003eG23 430i and 430i xDrive convertible\u003c\/li\u003e\n    \u003cli\u003eG26 430i and 430i xDrive Gran Coupe\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eEngines: B46, B46D, B48D\u003c\/p\u003e\n  \n  \u003ch3\u003eStone engineering - precision you can trust\u003c\/h3\u003e\n  \u003cp\u003eSince 1998 Stone has focused on high performance systems built to OE standards. Each kit starts with a full digital scan of the underbody and factory pipework. Flow and pressure modelling then define pipe diameter, routing and bend profiles. The result is a bolt-on sport system that fits perfectly and performs.\u003c\/p\u003e\n  \n  \u003ch4\u003e7 axis CNC bending\u003c\/h4\u003e\n  \u003cp\u003eHigh accuracy bending maintains roundness and wall integrity even on tight 180 degree sweeps, boosting flow stability and reducing stress points.\u003c\/p\u003e\n  \n  \u003ch4\u003eAdvanced welding\u003c\/h4\u003e\n  \u003cp\u003eCrisscross and overlapping welds reinforce hot zones, while robotic spot welding ensures consistent, clean joints for long term reliability.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhat is included\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eStone Exhaust factory-valve compatible sports system for BMW G20 G21 G22 G23 G26 330i and 430i - B46, B46D, B48D\u003c\/li\u003e\n    \u003cli\u003eOPF-compatible configuration with one-piece precision main section\u003c\/li\u003e\n    \u003cli\u003eOptional Stone Valvetronic single-valve kit with remote and OBDII controller available\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eFitting and support\u003c\/h3\u003e\n  \u003cp\u003eProfessional installation available at MJ Modifications in Warwickshire. For a tailored fitting quote, email info@mjmodifications.co.uk.\u003c\/p\u003e\n  \n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eAP537AG\u003c\/strong\u003e - dual exit with twin tailpipes, requires original bumper\u003c\/p\u003e\n  \n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust 2-year warranty.\u003c\/p\u003e\n  \n  \u003ch3\u003eGallery\u003c\/h3\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_BMW_B48D_G20_G21_330i_Cat-Back_Valvetronic_Exhaust_System_Stone_Exhaust_USA_-1_600x600.png?v=1591619032\" alt=\"Stone Exhaust BMW G20 G21 330i performance exhaust - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_BMW_B48D_G20_G21_330i_Cat-Back_Valvetronic_Exhaust_System_Stone_Exhaust_USA_-2_600x600.png?v=1591619041\" alt=\"BMW 330i B48 sports exhaust upgrade OPF friendly - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_BMW_B48D_G20_G21_330i_Cat-Back_Valvetronic_Exhaust_System_Stone_Exhaust_USA_-3_600x600.png?v=1591619048\" alt=\"G20 330i valve controlled exhaust system - MJ Modifications\"\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_BMW_B48D_G20_G21_330i_Cat-Back_Valvetronic_Exhaust_System_Stone_Exhaust_USA_-4_600x600.png?v=1591619121\" alt=\"G22 G23 G26 430i twin tailpipe exhaust - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \n  \u003ch3\u003eR and D and manufacturing imagery\u003c\/h3\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/1_9336c8b0-c9ea-4822-891c-83490f630707.jpg?v=1572705528\" alt=\"3D scanning and reverse engineering for exact BMW fit - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\" alt=\"7 axis CNC bending for high flow bends - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_1_1024x1024.jpg?v=1572828150\" alt=\"Advanced welding quality and strength - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_2_1024x1024.jpg?v=1572828178\" alt=\"Consistent robotic spot welds - MJ Modifications UK\"\u003e\u003c\/p\u003e\n  \n  \u003ch3\u003eSearch-friendly terms\u003c\/h3\u003e\n  \u003cp\u003eBMW 3 Series G20 sports exhaust, G21 Touring performance system, G22 430i coupe exhaust upgrade, G23 convertible exhaust, G26 Gran Coupe exhaust, 330i xDrive exhaust UK, 430i xDrive exhaust UK, B48 2.0T exhaust, B46 turbo exhaust, valve controlled back box, flap control exhaust, switchable exhaust, OPF safe exhaust, GPF compatible exhaust, catback exhaust for BMW 330i, catback exhaust for BMW 430i, BMW G-series exhaust upgrade, BMW 2.0 petrol performance exhaust, UK BMW exhaust specialist, deep tone exhaust with no drone, plug and play valve controller, touring exhaust system, dual exit twin tip exhaust, premium BMW exhaust UK.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"OEM Integrated Valve(s) \/ Dual Exit with Twin Tailpipes \/ Require Original Bumper \/ Flat Cut Gloss Carbon Fiber (102mm)","offer_id":56005676040578,"sku":null,"price":2427.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/1020CG_FlatCutGlossCarbonFibre_102mm-2_1024x1024_2x_0ea67024-f392-4e66-96ea-a059b80b1464.webp?v=1764021422","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-b48d-g20-g21-330i-cat-back-valvetronic-exhaust-system","provider":"MJ Modifications","version":"1.0","type":"link"}