{"product_id":"stone-exhaust-bmw-b58-g05-g06-cat-back-valvetronic-exhaust-system-inc-x5-40i-xdrive-x6-40i-xdrive","title":"Stone Exhaust OEM Integrated Valved Cat-Back Exhaust System for BMW X5 40i xDrive G05 \u0026 X6 40i xDrive G06 (B58)","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eUnlock the soundtrack your BMW deserves with a valve-controlled catback built for the B58\u003c\/h2\u003e\n  \n  \u003cp\u003eGive your G05 X5 40i xDrive or G06 X6 40i xDrive a deeper, richer tone and sharper response with the Stone valve-operated catback. This performance system integrates seamlessly with the factory flap control, so you get refined quiet cruising when closed and a purposeful, sporty note when open. Engineered around the B58 straight six using laser scanning, reverse engineering and in-house dyno development, it delivers the OEM-plus upgrade enthusiasts want without compromise.\u003c\/p\u003e\n  \n  \u003cp\u003eAt MJ Modifications we have installed this setup on customer cars and feedback has been outstanding. Crisp cold starts, a clean bass-heavy growl in sporty drive modes, and calm motorway manners with the valve shut. If you are after a premium G05 or G06 sound upgrade that looks factory, fits like factory and transforms character, this is it.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhy this catback stands out\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFactory valve integration for plug and play flap control via the original ECU and drive modes\u003c\/li\u003e\n    \u003cli\u003eDyno-developed for real-world improvements in throttle response and flow\u003c\/li\u003e\n    \u003cli\u003eHarmonised acoustics for a deep tone under load with minimal cabin boom on a cruise\u003c\/li\u003e\n    \u003cli\u003eDesigned from precise 3D scans for a direct bolt-on install and perfect alignment\u003c\/li\u003e\n    \u003cli\u003eConsistent build quality using machine welding and one-piece sections for durability\u003c\/li\u003e\n    \u003cli\u003eOptional Valvetronic remote kit available with OBDII controller for manual open or close at the touch of a button\u003c\/li\u003e\n    \u003cli\u003eOPF and GPF friendly when paired with the supplied module on request to avoid warning lights without coding\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eEngineering detail that delivers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eLaser-measured development to optimise flow, temperature and pressure characteristics\u003c\/li\u003e\n    \u003cli\u003eMulti-axis CNC mandrel bending for excellent roundness and accuracy throughout the bends\u003c\/li\u003e\n    \u003cli\u003eAdvanced joint design and overlapping weld techniques at high-stress points for longevity\u003c\/li\u003e\n    \u003cli\u003eRobotic spot welding for consistent penetration and a clean, repeatable finish\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eVehicle compatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eBMW G05 X5 40i xDrive 2017+\u003c\/li\u003e\n    \u003cli\u003eBMW G06 X6 40i xDrive 2018+\u003c\/li\u003e\n    \u003cli\u003eEngine: B58\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003ePart numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eAP542 - G05 X5 40i xDrive\u003c\/li\u003e\n    \u003cli\u003eAP549 - G06 X6 40i xDrive\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eOPF and GPF equipped cars\u003c\/h3\u003e\n  \u003cp\u003eRunning a particulate filter On request we can include Stone’s OPF delete solution at no extra cost to prevent error messages when fitting to OPF or GPF vehicles. No ECU coding required.\u003c\/p\u003e\n  \n  \u003ch3\u003eInstallation and support\u003c\/h3\u003e\n  \u003cp\u003eProfessional fitting recommended. MJ Modifications offers full installation and setup at our Warwickshire workshop. For a quote email info@mjmodifications.co.uk.\u003c\/p\u003e\n  \n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust 2 year warranty.\u003c\/p\u003e\n  \n  \u003ch3\u003eLooking for one of these\u003c\/h3\u003e\n  \u003cp\u003eBMW G05 sports exhaust, G06 sports exhaust, B58 performance system, X5 40i sound upgrade, X6 40i sound upgrade, flap-controlled catback, ECU-controlled exhaust valve, G05 back box upgrade, G06 back box upgrade, GPF-back exhaust, OPF-back system, UK BMW exhaust specialist, bolt-on BMW exhaust UK, no drone BMW B58, X5 40i tuning parts, X6 40i tuning parts, valved rear section, cat back exhaust for B58, performance exhaust UK for BMW X5 40i and BMW X6 40i.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"X5 40i xDrive","offer_id":56005662179714,"sku":null,"price":2741.76,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/StoneLogo1.5_1946x_d9d7fe59-7e52-42a4-9422-72064f157ad5.jpg?v=1764021280","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-b58-g05-g06-cat-back-valvetronic-exhaust-system-inc-x5-40i-xdrive-x6-40i-xdrive","provider":"MJ Modifications","version":"1.0","type":"link"}