{"product_id":"stone-exhaust-bmw-n55-f25-f26-cat-back-valvetronic-exhaustinc-x3-35i-xdrive-x4-35i-xdrive-x4-m40i-xdrive","title":"BMW F25 X3 35i xDrive, F26 X4 35i\/M40i xDrive Valvetronic Cat-Back Exhaust AP531S \/ AP531BSQ","description":"\u003cp\u003eDirect-fit valvetronic cat-back for BMW F25 and F26 chassis with N55 engines - no fabrication, no guesswork. Twin-exit (AP531S) or quad-exit (AP531BSQ), both require M40i rear bumper.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOBDII controller with ON \/ OFF \/ AUTO modes and custom RPM threshold\u003c\/li\u003e\n\u003cli\u003eNo drone on motorway; deep, responsive tone under load\u003c\/li\u003e\n\u003cli\u003e3D-scanned and CNC-bent to match factory geometry and flow paths\u003c\/li\u003e\n\u003cli\u003eBolt-on fitment - uses all OEM hangers and mounting points\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eEngineered in the UK for fast-road and track-day use. Not a quiet daily-driver exhaust, but not a shouty race pipe either - it knows when to behave.\u003c\/p\u003e","brand":"Stone Exhaust","offers":[{"title":"Dual Exit with Twin Tailpipes \/ Require M40i bumper \/ Flat Cut Gloss Carbon Fiber (82mm)","offer_id":54913185153367,"sku":null,"price":3056.64,"currency_code":"GBP","in_stock":true},{"title":"Dual Exit with Quad Tailpipes \/ Require M40i bumper \/ Flat Cut Gloss Carbon Fiber (82mm)","offer_id":54913185186135,"sku":null,"price":3150.72,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1038\/4575\/7271\/files\/1020CG_FlatCutGlossCarbonFibre_102mm-2_1024x1024_2x_36052d95-81f2-49a6-9e42-a7a4fe3304c9.webp?v=1788713854","url":"https:\/\/cuzracecars.com\/products\/stone-exhaust-bmw-n55-f25-f26-cat-back-valvetronic-exhaustinc-x3-35i-xdrive-x4-35i-xdrive-x4-m40i-xdrive","provider":"Cuz Race Cars","version":"1.0","type":"link"}