{"product_id":"stone-exhaust-bmw-b58-f22-f23-m240i-cat-back-valvetronic-exhaust","title":"Stone Exhaust OEM-Integrated Valved Cat-Back Exhaust System for BMW 2 Series F22\/F23 M240i \u0026 M240i xDrive (B58) | AP526B","description":"\u003cdiv\u003e\n\n  \u003ch2\u003eStone valve-controlled rear exhaust for BMW F22 F23 M240i and M240i xDrive B58 - Part AP526B\u003c\/h2\u003e\n\n  \u003cp\u003e\n    Give your B58-powered 2 Series the rich tone and refined manners it deserves. The Stone valve-controlled rear section and mid-pipe assembly is designed for the F22 and F23 M240i platform to elevate soundtrack, enhance flow and keep everyday comfort. It integrates with the factory valve motor for seamless drive mode operation and delivers a deeper, sportier note without the unwanted cabin boom at motorway speeds.\n  \u003c\/p\u003e\n\n  \u003cp\u003e\n    We have fitted Stone systems to customer cars and our own builds, and the feedback is consistently excellent. Crisp start-up bark, fuller mid‑range character and calm cruising when you want it. If you are searching for a premium M240i sound upgrade with factory-style valve functionality, precision fitment and proven development, this is the one to choose.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey reasons enthusiasts pick this system\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFactory valve integration for true drive mode control and daily usability\u003c\/li\u003e\n    \u003cli\u003eTight-tolerance fitment developed from detailed 3D scanning and reverse engineering\u003c\/li\u003e\n    \u003cli\u003eValidated on in-house dyno and acoustic rigs for flow and tone\u003c\/li\u003e\n    \u003cli\u003eConfident exhaust note with minimal cabin drone when cruising\u003c\/li\u003e\n    \u003cli\u003eOne-piece main section with precision mechanical welds for durability\u003c\/li\u003e\n    \u003cli\u003eOptional Stone Valvetronic upgrade for manual open or closed control via remote\u003c\/li\u003e\n    \u003cli\u003ePlug and play OBDII controller available with the Valvetronic option\u003c\/li\u003e\n    \u003cli\u003e7 axis CNC mandrel bending for consistent diameter and smooth gas velocity\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eFactory-style valve control\u003c\/h3\u003e\n  \u003cp\u003e\n    Keep your BMW character intact. With the integrated valve setup, the car’s ECU manages the flap automatically based on drive mode and load, giving you quiet refinement on the commute and a more aggressive soundtrack when you press on.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eOptional manual control\u003c\/h3\u003e\n  \u003cp\u003e\n    Want full say over volume. Add the Stone Valvetronic single-valve kit to switch between open and closed at the touch of a button. The plug and play OBDII module makes it easy to choose stealth or sport on demand.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eEngineered for performance and longevity\u003c\/h3\u003e\n  \u003cp\u003e\n    Stone engineers scan the original hardware to capture pipe routing, diameters and bend angles, then simulate flow, temperature and pressure to optimise the layout. 7 axis CNC bending ensures exceptional roundness through the radius to reduce turbulence. Overlapping and crisscross weld techniques are used at high-heat joints for strength you can rely on. The result is a high quality, high precision M240i system that fits right and sounds right.\n  \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 development for BMW M240i B58\" style=\"max-width: 100%; height: auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eBMW 2 Series F22 M240i and M240i xDrive 2015+\u003c\/li\u003e\n    \u003cli\u003eBMW 2 Series F22 LCI M240i and M240i xDrive 2016+\u003c\/li\u003e\n    \u003cli\u003eBMW 2 Series F23 M240i Convertible and M240i xDrive 2015+\u003c\/li\u003e\n    \u003cli\u003eBMW 2 Series F23 LCI M240i Convertible and M240i xDrive 2016+\u003c\/li\u003e\n    \u003cli\u003eEngine code B58\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSound and drivability\u003c\/h3\u003e\n  \u003cp\u003e\n    Developed using Stone’s dyno and acoustic testing, this system brings a richer, more purposeful tone while maintaining refinement for everyday use. It livens up the B58 without the harshness often associated with lesser systems.\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"margin: 12px 0;\"\u003e\n    \u003ciframe width=\"854\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/1tzoHH3vot4\" title=\"Stone Exhaust BMW M240i B58 cat back sound\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\n  \u003c\/div\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\u003eAP526B\u003c\/strong\u003e\u003c\/p\u003e\n\n  \u003ch3\u003eProfessional fitting\u003c\/h3\u003e\n  \u003cp\u003e\n    Prefer expert installation. MJ Modifications in Warwickshire can supply and fit this system. Email \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e for a quote and availability.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eSearch terms customers use\u003c\/h3\u003e\n  \u003cp\u003e\n    BMW 240i sports exhaust UK, F22 M240i rear section, F23 M240i convertible exhaust upgrade, B58 coupe exhaust system, M240i xDrive performance exhaust UK, BMW 2 Series 240i valve controlled exhaust, flap controlled back box M240i, BMW 2 Series F22 F23 sound upgrade, M240i performance pipework, BMW M240i sports system UK, Stone AP526B UK, BMW B58 M240i noise upgrade, BMW 240i stainless cat back, F22 240i silencer upgrade, M240i tuned exhaust note, B58 exhaust for BMW 2 Series, M240i AWD exhaust system UK, BMW 2 Series sport exhaust kit, M240i valve actuated exhaust, BMW 2 Series M240i tailpipe upgrade, BMW M240i sound improvement, B58 F22 performance exhaust solution.\n  \u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"OEM Integrated Valve(s) \/ Flat Cut Gloss Carbon Fiber (82mm)","offer_id":56008735097218,"sku":null,"price":2584.32,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/BMWB58F22F23M240i_Cat-BackValvetronicExhaust4-2_300x300_522ed470-17c4-43e0-833b-ffb980e9e02d.png?v=1764091556","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-b58-f22-f23-m240i-cat-back-valvetronic-exhaust","provider":"MJ Modifications","version":"1.0","type":"link"}