{"product_id":"stone-exhaust-bmw-b48-g20-330i-cat-back-exhaust-system","title":"Stone Exhaust Valvetronic Cat-Back Exhaust for BMW 330i\/430i (B48) G20 G21 G22 G23 G26 - OEM-Integrated, xDrive \u0026 OPF\/GPF Compatible - AP537","description":"\u003cdiv class=\"product__description rte\"\u003e\n\n  \u003ch2\u003eStone Exhaust BMW B48 G20 G21 G22 G23 OEM Integrated Valved Cat-Back Exhaust for 330i and 430i\u003c\/h2\u003e\n\n  \u003cp\u003eTransform the sound and performance of your BMW 330i or 430i with the Stone Exhaust OEM integrated valved cat-back exhaust system for the B48 engine. Engineered for G20, G21, G22 and G23 BMW platforms, this Stone cat-back delivers a sharper, richer exhaust note with genuine OEM fitment, no unwanted drone and proven power gains on the in-house dyno. Designed through 3D scanning and reverse engineering of the factory system, it bolts up cleanly and precisely while elevating everyday driveability and track-day excitement.\u003c\/p\u003e\n\n  \u003cp\u003eWe run Stone Exhaust on customer cars and in our own builds at Nforcd. Feedback has been consistently positive for build quality, fit and finish, and the refined yet aggressive B48 soundtrack. If you are searching for a BMW G20 cat back exhaust, BMW 330i valved exhaust or BMW 430i performance exhaust, this is the upgrade that ticks every box.\u003c\/p\u003e\n\n  \u003ch3\u003eWhy choose this Stone Exhaust cat-back\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eOEM integration for the factory valve setup on B48 models for true plug-and-play fitment\u003c\/li\u003e\n    \u003cli\u003eAvailable with Stone Valvetronic control kit and OBDII plug-and-play controller for manual open or close and auto valve control by RPM\u003c\/li\u003e\n    \u003cli\u003eEliminates the typical drone found on many standard and aftermarket systems\u003c\/li\u003e\n    \u003cli\u003eDeveloped on Stone Exhaust’s in-house dyno for measurable performance gains with the signature Stone sound\u003c\/li\u003e\n    \u003cli\u003eOne piece design for optimal flow and straightforward installation\u003c\/li\u003e\n    \u003cli\u003e3D scanning and reverse engineering ensure 100 percent OEM-style fit\u003c\/li\u003e\n    \u003cli\u003e7 axis CNC bending delivers up to 98 percent roundness and exceptional accuracy for smooth gas flow\u003c\/li\u003e\n    \u003cli\u003eCrisscross and overlapping welding techniques enhance strength and durability at high thermal stress points\u003c\/li\u003e\n    \u003cli\u003eDirect spot welding by mechanical arms for precise, consistent weld penetration\u003c\/li\u003e\n    \u003cli\u003eOPF delete harness available free of charge for OPF or GPF equipped cars to prevent error codes without ECU coding\u003c\/li\u003e\n    \u003cli\u003exDrive compatible\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat you will notice\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDeeper, cleaner B48 tone with more presence when the valves are open\u003c\/li\u003e\n    \u003cli\u003eRefined volume for daily use with valves closed\u003c\/li\u003e\n    \u003cli\u003eSmoother flow from precision-formed pipework and optimised routing\u003c\/li\u003e\n    \u003cli\u003eReal world power improvements validated on Stone’s dyno\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eRecommended pairing\u003c\/h3\u003e\n  \u003cp\u003eOften purchased with the Stone Exhaust BMW B48 G20 G30 Catless Downpipe or the Stone Exhaust BMW B48 G20 G30 Eddy Catalytic Performance Downpipe for further performance and sound enhancement.\u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cp\u003eB48 engine BMW 3 Series and 4 Series:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eBMW 3 Series G20 Saloon 330i and 330i xDrive\u003c\/li\u003e\n    \u003cli\u003eBMW 3 Series G21 Touring 330i and 330i xDrive\u003c\/li\u003e\n    \u003cli\u003eBMW 4 Series G22 Coupe 430i and 430i xDrive\u003c\/li\u003e\n    \u003cli\u003eBMW 4 Series G23 Convertible 430i and 430i xDrive\u003c\/li\u003e\n    \u003cli\u003eBMW 4 Series G26 Gran Coupe 430i and 430i xDrive\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eOPF delete information\u003c\/h3\u003e\n  \u003cp\u003eStone offers an OPF delete solution that can be included free of charge. This allows installation on OPF or GPF equipped cars without triggering an error code, so no ECU coding is required.\u003c\/p\u003e\n\n  \u003ch3\u003eR\u0026amp;D and manufacturing\u003c\/h3\u003e\n  \u003cp\u003eStone engineers 3D scan the OEM exhaust to analyse diameter, bend angles and routing before simulating gas flow, thermal zones and pressure in software. Production uses a 7 axis CNC bending machine for exceptional roundness and accuracy, with direct spot welding and crisscross or overlapping welds to maximise strength where temperatures are highest.\u003c\/p\u003e\n\n  \u003cdiv style=\"margin: 12px 0;\"\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 B48 G20 G21 G22 G23\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 12px 0;\"\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 machine precision pipework\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 12px 0;\"\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 welding quality crisscross and overlapping technique\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 12px 0;\"\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 strength and precision\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eSound check videos\u003c\/h3\u003e\n  \u003cdiv style=\"margin: 12px 0;\"\u003e\n    \u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/gCvoqm8agug\" title=\"Stone Exhaust B48 Valvetronic Cat-Back Sound Test\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin: 12px 0;\"\u003e\n    \u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/js0MWGt0SFg\" title=\"Stone Exhaust Eddy Catalytic Downpipe with Valvetronic Cat-Back\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eInstallation and fitting\u003c\/h3\u003e\n  \u003cp\u003eDirect bolt-on fitment with OEM integration. Professional installation recommended. Nforcd offers expert fitting in Warwickshire. Request a quote at Sales@nforcd.com.\u003c\/p\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust 2 year warranty.\u003c\/p\u003e\n\n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eAP537\u003c\/strong\u003e\u003c\/p\u003e\n\n  \u003ch3\u003ePopular search terms\u003c\/h3\u003e\n  \u003cp\u003eBMW 330i cat back exhaust, BMW 430i cat back exhaust, BMW G20 catback, BMW G21 330i exhaust, BMW G22 430i exhaust, BMW G23 430i exhaust, BMW G26 430i exhaust, B48 valved exhaust, BMW B48 performance exhaust, BMW 330i valvetronic exhaust, BMW 430i valvetronic exhaust, OPF back exhaust BMW, G20 330i performance exhaust, G22 430i sports exhaust, BMW 3 Series cat back, BMW 4 Series cat back, Stone Exhaust AP537.\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"OEM Integrated Valved \/ Flat Cut Gloss Carbon Fiber (102mm)","offer_id":42565750325436,"sku":null,"price":2427.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0552\/9465\/6700\/products\/1020CG_FlatCutGlossCarbonFibre_102mm-2_1024x1024_2x_2abc7f66-6ffe-4503-b306-ab2e6611bb19.webp?v=1681923168","url":"https:\/\/www.nforcd.com\/products\/stone-exhaust-bmw-b48-g20-330i-cat-back-exhaust-system","provider":"Nforcd","version":"1.0","type":"link"}