{"product_id":"stone-exhaust-bmw-b46-g20-f22-f30-f34-f32-catless-downpipes-inc-230i-330i-330i-xdrive-gt-430i-520i-530i","title":"Stone Exhaust BMW B46 Catless Downpipe (Non-OPF) - Decat Turbo Downpipe, Stainless - 230i 330i 430i 520i 530i - F22 F23 F30 F31 F34 F32 F33 F36 G30 G01 X3 G02 X4 - A224P","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eStone Exhaust De-Cat Front Pipe for BMW 2.0 B46 Petrol Turbo - Non OPF\u003c\/h2\u003e\n  \u003cp\u003e\n    Unlock faster spool, crisper throttle response and a richer exhaust tone from your BMW four-cylinder 2.0 turbo. This Stone Exhaust cat delete front section is engineered specifically for the B46 petrol engine without a particulate filter, delivering a free-flow route straight off the turbine for maximum efficiency and a proper motorsport soundtrack.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    Perfect for enthusiasts who want a high-flow turbo outlet on 230i, 330i, 430i, 520i and 530i models plus selected X3 and X4 variants, this race-only front pipe keeps factory-style fitment while dramatically reducing restriction compared to the OE catalyst.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eHighlights\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDe-cat turbo front pipe for BMW B46 2.0T petrol engines without OPF or GPF\u003c\/li\u003e\n    \u003cli\u003eOne-piece mandrel-bent stainless construction for smooth, high-velocity gas flow\u003c\/li\u003e\n    \u003cli\u003eIntegrated flex section to absorb thermal movement and lessen stress on joints\u003c\/li\u003e\n    \u003cli\u003eReinforced turbine flange with crisscross and overlapping welds for durability under heat\u003c\/li\u003e\n    \u003cli\u003eMechanised welding arms for consistent, precise weld penetration\u003c\/li\u003e\n    \u003cli\u003e3D scanning and reverse engineered routing to maintain clearances and OE-style fit\u003c\/li\u003e\n    \u003cli\u003e7-axis CNC bends with up to 98 percent roundness and under 0.025 mm tolerance\u003c\/li\u003e\n    \u003cli\u003eDirect replacement of the stock catalyst section - designed for straightforward installation\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eWhat you will notice\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eLower back pressure for more efficient turbo operation\u003c\/li\u003e\n    \u003cli\u003eQuicker boost build and sharper pedal response\u003c\/li\u003e\n    \u003cli\u003eDeeper, more purposeful exhaust note on the B46 2.0 turbo\u003c\/li\u003e\n    \u003cli\u003eHigh-quality fabrication aimed at fast-road and track reliability\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\n    We have installed and supplied these Stone Exhaust systems for our customers and feedback has been consistently positive on fit, finish, weld quality, sound and drivability gains.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eEngineering detail\u003c\/h3\u003e\n  \u003cp\u003e\n    Stone Exhaust uses state-of-the-art 3D flow measurement and reverse engineering of OEM components to create a one-piece, mandrel-formed path that minimises turbulence. Mechanical welding arms ensure no weld intrusion into the gas stream, helping maintain velocity and consistent performance. The result is a high-efficiency de-cat front section that supports turbine efficiency and repeatable, OEM-like fitment across B46 applications.\n  \u003c\/p\u003e\n  \u003cp\u003e\n    7-axis CNC bending delivers excellent roundness even at tight radii, helping avoid deformation that can disturb flow or concentrate stress. Combined with reinforced flange welding and a robust flex section, this assembly is built to tolerate the thermal demands of the B46 turbocharged platform.\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"text-align:left; margin:16px 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 B46 turbo front pipe\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align:left; margin:16px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\" alt=\"7-axis CNC bending for Stone Exhaust BMW B46 de-cat pipe\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align:left; margin:16px 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=\"Reinforced flange and precision welding on Stone Exhaust B46 turbo outlet\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eVehicle applications - B46 petrol without OPF\u003c\/h3\u003e\n  \u003cp\u003eBMW 2 Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF22 230i and 230i xDrive (2015+)\u003c\/li\u003e\n    \u003cli\u003eF22 LCI 230i (2017+) and 230i xDrive (2016+)\u003c\/li\u003e\n    \u003cli\u003eF23 230i and 230i xDrive (2015+)\u003c\/li\u003e\n    \u003cli\u003eF23 LCI 230i (2017+) and 230i xDrive (2016+)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003eBMW 3 Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF30 LCI 330i (2014+)\u003c\/li\u003e\n    \u003cli\u003eF31 LCI 330i xDrive (2015+)\u003c\/li\u003e\n    \u003cli\u003eF34 GT LCI 330i xDrive (2015+)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003eBMW 4 Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF32 LCI 430i and 430i xDrive (2016+)\u003c\/li\u003e\n    \u003cli\u003eF33 LCI 420i, 430i and 430i xDrive (2016+)\u003c\/li\u003e\n    \u003cli\u003eF36 LCI 420i, 420i xDrive and 430i (2016+)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003eBMW 5 Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eG30 520i (2018+)\u003c\/li\u003e\n    \u003cli\u003eG30 530i and 530i xDrive (2015+)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003eBMW X Series\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eG01 X3 20i xDrive (2017-2018) and X3 30i xDrive (2016-2018)\u003c\/li\u003e\n    \u003cli\u003eG02 X4 20i xDrive (2017-2019) and X4 30i xDrive (2017-2019)\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\n    For non-OPF vehicles only. Please check your car’s specification and the compatibility list before ordering.\n  \u003c\/p\u003e\n\n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eA224P\u003c\/strong\u003e\u003c\/p\u003e\n\n  \u003ch3\u003eInstallation and support\u003c\/h3\u003e\n  \u003cp\u003e\n    Professional fitting recommended. MJ Modifications offers installation at our Warwickshire workshop. To request a quote or confirm compatibility, email \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust 2-year warranty.\u003c\/p\u003e\n\n  \u003ch3\u003eUsage notice\u003c\/h3\u003e\n  \u003cp\u003e\n    De-cat exhaust components are intended for motorsport or off-road use where permitted. Regulations on emissions and aftermarket parts vary by region. Please ensure compliance with local laws before purchase and installation.\n  \u003c\/p\u003e\n\n  \u003ch3\u003ePopular searches\u003c\/h3\u003e\n  \u003cp\u003e\n    BMW B46 de cat pipe, BMW 2.0T turbo front pipe, BMW 230i exhaust upgrade UK, 330i de cat UK, 430i high flow front section, 520i turbo outlet, 530i race front pipe, BMW F22 F23 F30 F31 F34 F32 F33 F36 G30 fitment, X3 20i 30i front pipe, X4 20i 30i front pipe, non particulate filter B46 exhaust, GPF-less BMW 2.0 turbo, performance exhaust front pipe, BMW four-cylinder turbo de-cat, turbo down pipe B46, BMW performance parts UK, MJ Modifications fitting Warwickshire.\n  \u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Default Title","offer_id":55978647159170,"sku":null,"price":930.24,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/20170424034657_1946x_cf652cc9-fd32-432f-ba95-a6fa33b91a92.png?v=1763380080","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-b46-g20-f22-f30-f34-f32-catless-downpipes-inc-230i-330i-330i-xdrive-gt-430i-520i-530i","provider":"MJ Modifications","version":"1.0","type":"link"}