{"product_id":"stone-exhaust-bmw-n20-f25-f26-cat-back-valvetronic-exhaust-system-inc-x3-28i-x4-28i","title":"Stone Exhaust BMW N20 F25 X3 28i \u0026 F26 X4 28i xDrive Valvetronic Cat-Back Exhaust System (2013+) – Valved, No-Drone, Plug \u0026 Play OBDII Controller","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eSwitchable Catback for BMW F25 X3 28i and BMW F26 X4 28i xDrive 2013 onwards\u003c\/h2\u003e\n\n  \u003cp\u003eGive your 2.0 turbo BMW the soundtrack and response it deserves with the Stone valve controlled catback system for the F25 X3 28i and F26 X4 28i xDrive. This premium rear section upgrade is designed around the N20 engine and delivers a deeper, richer tone in Sport while remaining neighbour friendly in Comfort. Expect sharper throttle feel, tasteful cabin character and OEM quality fitment with a simple plug in control module via the OBD port.\u003c\/p\u003e\n\n  \u003cp\u003eWe have installed and driven this system extensively at MJ Modifications. Feedback from owners is consistently positive on the sound quality, drone free cruising and the slick factory style fit. If you are searching for a BMW X3 28i sports exhaust, BMW X4 28i xDrive switchable exhaust, N20 2.0T catback or a remote valve exhaust for F25 or F26, this is the one to choose.\u003c\/p\u003e\n\n  \u003ch3\u003eKey reasons enthusiasts choose this system\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eSwitchable valve control with quiet, aggressive and automatic rpm based modes\u003c\/li\u003e\n    \u003cli\u003ePlug in OBD controller and remote for fast, tidy installation and easy operation\u003c\/li\u003e\n    \u003cli\u003eDrone free refinement at motorway speeds with a deep, classy tone under load\u003c\/li\u003e\n    \u003cli\u003eOne piece layout for consistent flow and durability\u003c\/li\u003e\n    \u003cli\u003e7 axis CNC bent pipework and precise welds for strength and repeatable alignment\u003c\/li\u003e\n    \u003cli\u003eDeveloped using 3D scanning, reverse engineering and in house dyno validation\u003c\/li\u003e\n    \u003cli\u003eDirect replacement using factory mounting points for genuine OEM like fit\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eHow the valve control works\u003c\/h3\u003e\n  \u003cp\u003eThe included controller plugs into your OBD port. Use the remote to choose:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eOn mode for maximum sound and flow\u003c\/li\u003e\n    \u003cli\u003eOff mode for refined, neighbour considerate cruising\u003c\/li\u003e\n    \u003cli\u003eAuto mode to open at your chosen rpm threshold\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eNo cutting of wiring is required. It is a clean, reversible install that retains full control in the cabin.\u003c\/p\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eBMW F25 X3 28i including xDrive\u003c\/li\u003e\n    \u003cli\u003eBMW F26 X4 28i xDrive\u003c\/li\u003e\n    \u003cli\u003eModel years 2013 onwards where applicable\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eExit styles and part numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAP541BS\u003c\/strong\u003e - Single left exit with twin tips, suits the original bumper\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAP536BS\u003c\/strong\u003e - Dual exit with twin tips, requires M40i bumper\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAP536BSQ\u003c\/strong\u003e - Dual exit with quad tips, requires M Sport bumper\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003ePlease select the configuration that matches your rear bumper style. Tip layout and bumper cut outs must correspond.\u003c\/p\u003e\n\n  \u003ch3\u003eEngineering detail that makes the difference\u003c\/h3\u003e\n  \u003cp\u003eStone maps the factory system with high resolution 3D scanning, then optimises gas flow, bend angles and routing for the N20 platform. The result is a performance catback that enhances tone and response without compromising everyday comfort.\u003c\/p\u003e\n  \u003cp\u003eManufacturing highlights include 7 axis CNC bending for exceptional roundness, crisscross and overlapping welds in high temperature zones and consistent spot welding by mechanical arms for strong, repeatable joints. It looks as good as it sounds.\u003c\/p\u003e\n\n  \u003ch3\u003eHear it\u003c\/h3\u003e\n  \u003cp\u003eStone valve control module overview\u003c\/p\u003e\n  \u003cdiv class=\"video-wrapper\" style=\"margin: 10px 0;\"\u003e\n    \u003ciframe width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/V5c4VEyO1EM\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n  \u003cp\u003eBMW F26 X4 28i xDrive with Stone switchable catback\u003c\/p\u003e\n  \u003cdiv class=\"video-wrapper\" style=\"margin: 10px 0;\"\u003e\n    \u003ciframe width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/VGY4fmbXfHI\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eImages\u003c\/h3\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled_b8bcd55c-e3b4-4f25-bdf1-06615e12c699_600x600.png?v=1588847477\" alt=\"Stone Exhaust BMW F25 F26 N20 catback valve controlled system 1\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled1_ada888a4-e46e-453b-ae74-3657fa006211_600x600.png?v=1588847486\" alt=\"BMW X3 X4 28i switchable exhaust rear section 2\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled2_204abdef-5bf1-4eab-a99e-22fc47657237_600x600.png?v=1588847494\" alt=\"Performance catback for BMW N20 F25 F26 3\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled3_a3755048-6a32-4c10-a6df-c149716f3db1_600x600.png?v=1588847503\" alt=\"BMW F25 F26 valve control exhaust components 4\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled4_c1614146-e284-4b58-8588-58be4ff1d3fa_600x600.png?v=1588847512\" alt=\"Stone Exhaust catback kit tip options 5\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Untitled5_05ae19a9-421c-4701-814d-7726dcfb4224_600x600.png?v=1588847522\" alt=\"BMW X3 X4 28i twin and quad exit configuration 6\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eR and D and simulation\u003c\/h3\u003e\n  \u003cp\u003eUsing 3D modelling and simulation, the team analyses pipe diameter, bend radii and heat zones, then iterates to maximise gas velocity and maintain cabin refinement. The end product is a direct fit catback that elevates your BMW X3 28i or X4 28i xDrive without compromise.\u003c\/p\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 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 for BMW N20 exhaust development\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eManufacturing focus\u003c\/h3\u003e\n  \u003cp\u003e7 axis CNC bending preserves internal diameter and flow. Overlapping and crisscross welds add strength where heat is highest. Robotic spot welding ensures consistent penetration and a long lasting joint. It is engineered for daily use and weekend fun.\u003c\/p\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 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=\"Precision welding on performance exhaust systems 1\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 10px 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=\"Precision welding on performance exhaust systems 2\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eBacked by a 2 year warranty from Stone.\u003c\/p\u003e\n\n  \u003ch3\u003eProfessional fitting by MJ Modifications\u003c\/h3\u003e\n  \u003cp\u003eWant it installed perfectly first time. Book expert 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\u003eSearching for the right upgrade\u003c\/h3\u003e\n  \u003cp\u003eBMW X3 28i performance exhaust UK, BMW X4 28i xDrive sports exhaust, F25 switchable exhaust, F26 remote valve exhaust, N20 2.0T catback system, BMW 2.0 turbo sound upgrade, quad tip exhaust for BMW X4, twin tip exhaust for BMW X3, droneless touring exhaust for BMW, OBD port exhaust valve controller, plug in exhaust controller, BMW X3 2.0 petrol exhaust, BMW X4 2.0 petrol exhaust.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Single Exit (Left) with Twin Tailpipes \/ Require Original Bumper \/ Flat Cut Gloss Carbon Fibre (82mm)","offer_id":56008690041218,"sku":null,"price":2710.08,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/8200CG_FlatCutGlossCarbonFiber82mmExhuastTailpipes_1946x_430abfe0-e751-490d-acb0-99bb09582fab.png?v=1764090796","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-n20-f25-f26-cat-back-valvetronic-exhaust-system-inc-x3-28i-x4-28i","provider":"MJ Modifications","version":"1.0","type":"link"}