{"product_id":"stone-exhaust-bmw-n20-f20-f22-f30-f32-f36-catless-downpipes-inc-125i-220i-228i-320i-328i-420i-428i","title":"Stone Exhaust BMW F-Series N20 2.0T Catless Downpipe | DeCat\/De-Cat Front Pipe | Turbo Outlet Straight\/Test Pipe (Catalyst Delete) - F20 F21 F22 F23 F30 F31 F32 F33 F36 - 120i 220i 228i 320i 328i 420i 428i - A205P","description":"\u003cdiv\u003e\n  \u003ch2\u003eStone Exhaust Turbo Outlet Pipe for BMW N20 2.0T F-Series | Track-use de-cat front pipe upgrade\u003c\/h2\u003e\n\n  \u003cp\u003eTransform throttle response and turbo spool on your BMW N20 2.0 turbo with this race-spec catalyst delete front pipe from Stone Exhaust. Engineered for the F-Series 1 Series, 2 Series, 3 Series and 4 Series, this high-flow turbo outlet pipe replaces the restrictive factory catalytic converter section to free up exhaust velocity, sharpen boost response and deliver a deeper, more purposeful soundtrack.\u003c\/p\u003e\n\n  \u003cp\u003eBuilt using advanced 3D scanning, precision CNC bending and robotic welding, the Stone Exhaust system offers exact fitment, outstanding durability and a clean, smooth internal bore for optimum gas flow. We have installed these units for years and the results are consistently excellent. Customers repeatedly praise the flawless fit, premium construction and the way the car feels more eager through the rev range.\u003c\/p\u003e\n\n  \u003ch3\u003eHighlights that set it apart\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDirect swap for the OEM front section on BMW N20 2.0T engines across F20, F21, F22, F23, F30, F31, F32, F33 and F36 platforms\u003c\/li\u003e\n    \u003cli\u003eSuitable for 120i, 220i, 228i, 320i, 328i, 420i and 428i applications\u003c\/li\u003e\n    \u003cli\u003eDesigned to reduce back pressure for improved turbo efficiency and a richer exhaust tone\u003c\/li\u003e\n    \u003cli\u003eUnique flex joint to help protect against cracking under extreme heat cycles\u003c\/li\u003e\n    \u003cli\u003eCrisscross and overlapping weld technique to reinforce the turbo flange under high thermal load\u003c\/li\u003e\n    \u003cli\u003eOne-piece mandrel-style bends for uninterrupted flow and fewer potential weak points\u003c\/li\u003e\n    \u003cli\u003eRobot-assisted welding for consistent, high-penetration joints and long-term strength\u003c\/li\u003e\n    \u003cli\u003eTrue OEM-style alignment for a hassle-free install\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eEngineering you can rely on\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust employs 3D flow analysis and reverse engineering to optimise diameter, routing and bend geometry. The internal surface is exceptionally smooth, minimising turbulence and weld intrusion for maximum exhaust-gas efficiency from the turbine outlet onward.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eR\u0026amp;D and 3D scan workflow\u003c\/strong\u003e\u003cbr\u003e\n  Factory components are digitised to examine routing and pinch points, then simulated for gas speed, heat and pressure zones. The team iterates until the most efficient, durable solution is achieved for the N20 2.0T architecture.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003e7-axis CNC bending\u003c\/strong\u003e\u003cbr\u003e\n  Aerospace-grade bending keeps up to 98 percent roundness with only 25 percent outer-bend wear at tight 180-degree turns, maintaining cross-sectional area and reducing stress. Tolerances are exceptionally tight at approximately 0.025 mm for a precise, rattle-free fit.\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003eReinforced flange and robotic welds\u003c\/strong\u003e\u003cbr\u003e\n  The turbo flange area endures extreme temperatures. Stone’s overlapping weld pattern increases width and penetration, while direct spot welding by robotic arms ensures uniformity, strength and longevity.\u003c\/p\u003e\n\n  \u003cdiv style=\"margin: 18px 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=\"3D scanning and reverse engineering of BMW N20 turbo outlet pipe by Stone Exhaust\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 18px 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 high-flow BMW N20 front pipe\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 18px 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 turbo flange with overlapping welds on BMW N20 de-cat pipe\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"margin: 18px 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=\"Robot-welded joints on Stone Exhaust N20 turbo down pipe\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eEngine:\u003c\/strong\u003e BMW N20 2.0 turbo petrol\u003c\/p\u003e\n\n  \u003cp\u003e\u003cstrong\u003e1 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF20 120i, including LCI\u003c\/li\u003e\n    \u003cli\u003eF21 120i\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\u003cstrong\u003e2 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF22 220i, 228i, 228i xDrive\u003c\/li\u003e\n    \u003cli\u003eF23 220i\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\u003cstrong\u003e3 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF30 320i, 328i, including xDrive and LCI variants\u003c\/li\u003e\n    \u003cli\u003eF31 320i, 320i xDrive, 328i, 328i xDrive, plus LCI\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cp\u003e\u003cstrong\u003e4 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF32 420i, 420i xDrive, 428i, 428i xDrive\u003c\/li\u003e\n    \u003cli\u003eF33 420i, 428i, 428i xDrive\u003c\/li\u003e\n    \u003cli\u003eF36 420i, 420i xDrive, 428i, 428i xDrive\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eA205P\u003c\/strong\u003e\u003c\/p\u003e\n\n  \u003ch3\u003eWhat our customers say\u003c\/h3\u003e\n  \u003cp\u003eWe have fitted many of these at MJ Modifications and feedback is always positive: tight tolerances, no drama during installation and a noticeable step-up in response and sound quality. If you want a premium N20 turbo outlet upgrade that fits right and performs, this is the one to choose.\u003c\/p\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eBacked by Stone Exhaust with a 2-year warranty.\u003c\/p\u003e\n\n  \u003ch3\u003eProfessional fitting\u003c\/h3\u003e\n  \u003cp\u003eWant it installed properly first time? Book fitting with MJ Modifications in Warwickshire. Request a quote at \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n\n  \u003ch3\u003eImportant note\u003c\/h3\u003e\n  \u003cp\u003eThis product is a de-cat track component. For motorsport and off-road use only where permitted. Check local regulations before purchase and installation.\u003c\/p\u003e\n\n  \u003ch3\u003ePhotos\u003c\/h3\u003e\n  \u003cdiv style=\"margin: 18px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled_ebe1ce74-fc4f-41cd-968e-32ba2013f03b_600x600.png?v=1588839360\" alt=\"Stone Exhaust N20 F36 420i race front pipe installed\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin: 18px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled3_3f51aea7-4d6e-4830-8a4c-79ec975568d7_600x600.png?v=1588839387\" alt=\"BMW N20 turbo outlet pipe detail on vehicle\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin: 18px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled2_b0aaacb9-e7f2-404a-a2b1-5bb8ad0216aa_600x600.png?v=1588839377\" alt=\"F30 328i N20 straight-through front pipe installed view\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"margin: 18px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled3_3f51aea7-4d6e-4830-8a4c-79ec975568d7_600x600.png?v=1588839387\" alt=\"Stone Exhaust F-Series N20 performance turbo pipe close-up\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eVideo\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eBMW F36 N20 420i complete exhaust sound\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cdiv style=\"position:relative; padding-bottom:56.25%; height:0; overflow:hidden;\"\u003e\n    \u003ciframe src=\"https:\/\/www.youtube.com\/embed\/J_4rDcujVCM\" title=\"BMW F36 N20 420i exhaust sound\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute; top:0; left:0; width:100%; height:100%;\"\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n\n  \u003chr style=\"margin: 24px 0;\"\u003e\n\n  \u003cp\u003e\u003cstrong\u003eSearch terms:\u003c\/strong\u003e BMW N20 turbo outlet pipe, BMW N20 catalyst delete, BMW N20 front pipe, BMW 2.0T race pipe, F20 120i exhaust upgrade, F21 120i turbo pipe, F22 220i performance pipe, F23 220i exhaust mod, F30 320i high-flow front pipe, F31 328i performance down pipe alternative, F32 420i de-cat pipe, F33 428i turbo pipe UK, F36 420i straight pipe, 228i turbo front pipe upgrade, 428i N20 tuning hardware, BMW F-Series N20 exhaust modification, high flow turbo outlet, reduced back pressure N20, robot welded stainless pipe, 3D scanned exhaust, CNC bent pipe, flex joint turbo pipe, UK fitment BMW N20, track only exhaust part.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Default Title","offer_id":56005682332034,"sku":null,"price":772.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/201704071122590_1946x_c45e811b-20b1-472d-9ab3-2488f0f43d6d.png?v=1764021489","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-n20-f20-f22-f30-f32-f36-catless-downpipes-inc-125i-220i-228i-320i-328i-420i-428i","provider":"MJ Modifications","version":"1.0","type":"link"}