{"product_id":"stone-exhaust-bmw-b48-g30-g31-cat-back-valvetronic-exhaust-system-520i-530i","title":"Stone Exhaust Valved Switchable (Valvetronic) Cat-Back for BMW 5 Series 520i G30\/G31 Saloon\/Touring (2016-2019) B48 – Active Valve\/Flap Sport Performance Exhaust, OEM Valve Control, OPF\/PPF Delete, Rear Silencer\/Backbox – AP527A","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003ch2\u003eSwitchable Catback System for BMW 5 Series G30 G31 520i B48\u003c\/h2\u003e\n  \u003cp\u003e\u003cstrong\u003ePart Number: AP527A\u003c\/strong\u003e - requires original bumper\u003c\/p\u003e\n\n  \u003cp\u003eGive your 5 Series the soundtrack it deserves with this premium switchable catback for the BMW G30 Saloon and G31 Touring 520i B48 2.0 turbo. Engineered to work with the factory valve, it delivers calm, refined cruising when closed and a fuller, more purposeful tone when opened. Ideal for drivers who want a tasteful performance upgrade, sharper response and everyday usability in one package.\u003c\/p\u003e\n\n  \u003cp\u003eWe have installed and used this system ourselves at MJ Modifications and customer feedback has been consistently excellent. Fitment is precise, the finish is superb and the sound character is exactly what enthusiasts want from a quality BMW performance exhaust.\u003c\/p\u003e\n\n  \u003cdiv style=\"margin: 20px 0;\"\u003e\n    \u003cstrong\u003eHear it in action\u003c\/strong\u003e\n    \u003cdiv style=\"margin-top: 10px;\"\u003e\n      \u003ciframe allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\" frameborder=\"0\" width=\"854\" height=\"480\" src=\"https:\/\/www.youtube.com\/embed\/tufMSsCZP6w\"\u003e\u003c\/iframe\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eWhy enthusiasts choose this setup\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFactory-valve compatible switchable exhaust - stealth on demand, sports tone when you want it\u003c\/li\u003e\n    \u003cli\u003eSimple control via plug-and-play OBD2 valve controller\u003c\/li\u003e\n    \u003cli\u003eOne-piece layout for accurate fitment and smooth gas flow\u003c\/li\u003e\n    \u003cli\u003eConsistent machine welding for a clean, high quality finish\u003c\/li\u003e\n    \u003cli\u003eDeveloped using 3D scanning and reverse engineering for the B48 platform\u003c\/li\u003e\n    \u003cli\u003eDesigned specifically for BMW 520i G30 G31 2016 to 2019\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eOPF and PPF support\u003c\/h3\u003e\n  \u003cp\u003eAn OPF delete option can be supplied at no extra charge, allowing fitment to OPF or PPF equipped vehicles without triggering a warning light. Please check local laws and intended vehicle use before selecting this option.\u003c\/p\u003e\n\n  \u003ch3\u003eEngineering detail\u003c\/h3\u003e\n  \u003cp\u003eEach system is developed from OEM data captured with 3D scanning to map routing, diameter and bend geometry on the G30 G31 520i. Iteration with flow simulation focuses on maintaining velocity and managing pressure for the B48 engine.\u003c\/p\u003e\n  \u003cp\u003ePrecision 7-axis CNC bending targets exceptional roundness through tight radii, helping reduce turbulence and improving consistency. Welding techniques include overlapping and crisscross patterns on high heat areas, with robotic spot welding used for depth and uniformity across the assembly.\u003c\/p\u003e\n\n  \u003cdiv style=\"text-align: left; 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 for BMW G30 G31 520i performance exhaust\" style=\"max-width: 100%; height: auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 20px 0;\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\" alt=\"Precision CNC bending for BMW 520i G30 G31 catback system\" style=\"max-width: 100%; height: auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; 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=\"High quality welding for BMW 5 Series G30 G31 exhaust upgrade\" style=\"max-width: 100%; height: auto;\"\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"text-align: left; margin: 20px 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=\"Robotic spot welding for BMW B48 520i exhaust system\" style=\"max-width: 100%; height: auto;\"\u003e\n  \u003c\/div\u003e\n\n  \u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n  \u003cp\u003eBMW 5 Series with B48 engine:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eG30 520i 2016 to 2019\u003c\/li\u003e\n    \u003cli\u003eG31 520i 2016 to 2019\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eGreat combinations\u003c\/h3\u003e\n  \u003cp\u003eFrequently paired with the Stone B48 G20 G30 Catless Performance Downpipe 330i 520i 530i or the Stone B48 G20 G30 Eddy Catalytic Performance Downpipe 330i 520i 530i for a full B48 exhaust upgrade pathway.\u003c\/p\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eStone Exhaust 2 year warranty.\u003c\/p\u003e\n\n  \u003ch3\u003eProfessional fitting\u003c\/h3\u003e\n  \u003cp\u003eFor installation, book 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\u003eSearch-friendly terms\u003c\/h3\u003e\n  \u003cp\u003eBMW G30 520i sports exhaust, G31 520i Touring performance exhaust, active valve exhaust BMW 5 Series, switchable flap exhaust 2.0 turbo, BMW 520i catback UK, B48 exhaust upgrade, G30 Saloon exhaust system, G31 Touring exhaust system, BMW 5 Series valve controlled exhaust, OPF PPF compatible exhaust solution, rear silencer and centre section upgrade, performance backbox BMW 520i.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"Dual Exit with Quad Tailpipes (Require Original Bumper) \/ Flat Cut Gloss Carbon Fiber (102mm)","offer_id":55977882616194,"sku":null,"price":2427.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/1020CG_FlatCutGlossCarbonFibre_102mm-2_1024x1024_2x_53c6eac7-69e6-4095-b1ab-452c2e7cee9c.png?v=1763377159","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-b48-g30-g31-cat-back-valvetronic-exhaust-system-520i-530i","provider":"MJ Modifications","version":"1.0","type":"link"}