{"product_id":"stone-exhaust-bmw-n20-f10-f11-520i-eddy-catalytic-downpipe","title":"Stone Exhaust Eddy Catalytic Downpipe for BMW 5 Series N20 (F10\/F11 2010-2017) 520i 528i - High-Flow Catted Sports Cat, Euro 6 Compliant \u0026 MOT Friendly, SUS304, Direct Fit - A206E","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eStone Exhaust Eddy Catalytic Front Pipe for BMW 5 Series F10 F11 520i 528i - Part A206E\u003c\/h2\u003e\n  \n  \u003cp\u003eGive your turbocharged 5 Series the response, tone and reliability it deserves. This Stone Exhaust eddy catalytic front section is a direct bolt-on upgrade for BMW 520i and 528i models with the N20 engine, engineered to increase flow, sharpen spool-up and keep emissions in check. Euro 6 compliant and UK MOT friendly, it delivers the sweet spot of performance and refinement without compromising drivability.\u003c\/p\u003e\n  \n  \u003cp\u003e\u003cstrong\u003ePart Number: A206E\u003c\/strong\u003e\u003c\/p\u003e\n  \n  \u003ch3\u003eWhy enthusiasts choose this sport catalyst\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eEddy catalytic core creates a controlled vortex for fast gas speed and clean emissions\u003c\/li\u003e\n    \u003cli\u003eLow rpm efficiency comparable to a 400 CEL cat, high rpm flow similar to a 100 cell sports catalyst\u003c\/li\u003e\n    \u003cli\u003eOptimised lambda sensor placement for accurate readings and CEL-free running\u003c\/li\u003e\n    \u003cli\u003eTrue plug-and-play fitment using factory positions and mounts\u003c\/li\u003e\n    \u003cli\u003eCrafted from premium SUS304 stainless steel for long-term durability\u003c\/li\u003e\n    \u003cli\u003eMulti-axis mandrel bends maintain roundness for smooth, turbulence-free flow\u003c\/li\u003e\n    \u003cli\u003eReinforced welds at the turbo flange for strength at extreme temperatures\u003c\/li\u003e\n    \u003cli\u003eEuro 6 compliant and MOT friendly design for road use peace of mind\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eReal-world gains you can feel\u003c\/h3\u003e\n  \u003cp\u003eStone’s patented eddy catalytic technology balances back pressure for the N20 turbo. Around town you get strong low-end torque and crisp throttle pick-up. Under full load the vortex core opens the pathway, letting the turbo breathe for stronger midrange and a more urgent top end. The result is faster boost response, a more engaging exhaust note and smoother acceleration compared with the restrictive factory front catalyst.\u003c\/p\u003e\n  \n  \u003ch3\u003eWe fit these and we rate them\u003c\/h3\u003e\n  \u003cp\u003eWe have installed this system on customer cars and the feedback has been consistently excellent for fitment quality, sound and drivability. If you want a performance catalyst that behaves on the road yet unlocks your N20’s potential, this is the upgrade we recommend.\u003c\/p\u003e\n  \n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cp\u003eBMW 5 Series with N20 engine:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eF10 520i and 528i, including xDrive, 2010 to 2013\u003c\/li\u003e\n    \u003cli\u003eF10 LCI 520i and 528i, including xDrive, 2012 to 2016\u003c\/li\u003e\n    \u003cli\u003eF11 Touring 520i and 528i, including xDrive, 2012 to 2013\u003c\/li\u003e\n    \u003cli\u003eF11 LCI Touring 520i and 528i, including xDrive, 2013 to 2017\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eEngineering and build\u003c\/h3\u003e\n  \u003cp\u003eEach application is 3D scanned from the OEM part to replicate geometry and clearances precisely, then refined using flow analysis to optimise gas speed and temperature control. The tube work is formed with 7-axis CNC mandrel bending to keep up to 98 percent roundness, while the turbo end features criss-cross and overlapping weld techniques to survive 800 to 1100°C hot spots. SUS304 stainless steel resists corrosion, and the sensor bosses are positioned for accurate readings and long sensor life.\u003c\/p\u003e\n  \n  \u003cdiv style=\"margin: 20px 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 5 Series N20 front catalyst upgrade\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv style=\"margin: 20px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\" alt=\"Multi-axis CNC mandrel bending for smooth flow and accuracy\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv style=\"margin: 20px 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 welding on turbo flange for high heat strength\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \n  \u003ch3\u003eFitting and support\u003c\/h3\u003e\n  \u003cp\u003eProfessional installation recommended. MJ Modifications in Warwickshire offer fitting for this application. Request a quote at \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\u003c\/p\u003e\n  \n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust 2 Year Warranty.\u003c\/p\u003e\n  \n  \u003ch3\u003eWatch and gallery\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eBMW F10 520i with Stone Exhaust eddy catalytic front section and valved cat-back\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\/CzhKeM5qSDc\" style=\"position:absolute; top:0; left:0; width:100%; height:100%;\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n  \n  \u003cdiv style=\"margin: 20px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled_eb52ec60-2793-4cd9-a42a-660e2c540e2e_600x600.png?v=1588767434\" alt=\"Stone Exhaust sport catalyst installed on BMW F10 F11 520i 528i\" style=\"max-width:100%; height:auto;\"\u003e\n  \u003c\/div\u003e\n  \n  \u003ch3\u003eSearch phrases to help you find this product\u003c\/h3\u003e\n  \u003cp\u003eBMW 5 Series turbo outlet pipe, BMW 520i sports catalyst, BMW 528i performance cat, F10 F11 front cat section, N20 turbo front pipe upgrade, Euro 6 sports catalyst for BMW, MOT friendly sport cat UK, stainless 304 turbo outlet, direct bolt-on catalyst upgrade, Stone Exhaust A206E, BMW 5 Series N20 turbo spool upgrade, lambda friendly sport cat, CEL safe catalyst, high flow front catalyst BMW 5er, BMW 520i 528i Touring saloon exhaust upgrade, xDrive compatible sport cat, performance catalytic converter for BMW N20.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Default Title","offer_id":55977887793538,"sku":null,"price":1401.6,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/201707041018320_1946x_2a92bb8c-558a-4337-b3ee-e360df874ac6.png?v=1763377175","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-n20-f10-f11-520i-eddy-catalytic-downpipe","provider":"MJ Modifications","version":"1.0","type":"link"}