{"product_id":"stone-exhaust-bmw-n55-f22-f23-m235i-cat-back-valvetronic-exhaust","title":"F22 F23 BMW M235i N55 valved cat-back exhaust AP504B","description":"\u003cp\u003eDirect-fit valved cat-back for F22 and F23 M235i models with the N55 engine. No coding, no modules - factory valve control works straight out of the box.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM-integrated valve operation\u003c\/strong\u003e - closed valve = refined daily driver tone; open valve = deep, motorsport-inspired bark\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrone-free design\u003c\/strong\u003e - engineered for real-world use, not just peak noise on a dyno\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOne-piece construction\u003c\/strong\u003e - fewer joints, better flow, improved long-term reliability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7-axis CNC bent tubing\u003c\/strong\u003e - maintains near-perfect roundness for consistent gas flow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIn-house dyno validated\u003c\/strong\u003e - sound and flow tuned on actual N55 M235i chassis\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Stone Exhaust","offers":[{"title":"Flat Cut Gloss Carbon Fiber (82mm)","offer_id":54913184727383,"sku":null,"price":2584.32,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1038\/4575\/7271\/files\/1020CG_FlatCutGlossCarbonFibre_102mm-2_300x300_ef8c51a3-ae8f-4312-bdc0-a77dc8fb6870.png?v=1788713851","url":"https:\/\/cuzracecars.com\/products\/stone-exhaust-bmw-n55-f22-f23-m235i-cat-back-valvetronic-exhaust","provider":"Cuz Race Cars","version":"1.0","type":"link"}