{"product_id":"stone-exhaust-bmw-n55-f20-f21-m135i-cat-back-valvetronic-exhaust","title":"BMW M135i F20 F21 N55 valved cat-back exhaust AP504A","description":"\u003cp\u003eDirect-fit valved cat-back for F20 and F21 M135i models with the N55 engine - no coding, no adapters, no guesswork. OEM valve control integrates cleanly with your existing ECU.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eOEM-style valve operation: quiet cruise, full aggressive note on demand\u003c\/li\u003e\n\u003cli\u003eZero drone thanks to tuned resonator and flow-optimised 7-axis pipework\u003c\/li\u003e\n\u003cli\u003eOne-piece construction with crisscross welded joints for strength and consistency\u003c\/li\u003e\n\u003cli\u003eIncludes Valvetronic remote (OBDII plug-and-play) for instant mode switching\u003c\/li\u003e\n\u003cli\u003eValidated for UK roads and climate - fits RWD, xDrive and LCI variants\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eNot a daily-driver compromise or a track-only shoutbox - it’s a fast-road exhaust that works as hard as you do.\u003c\/p\u003e","brand":"Stone Exhaust","offers":[{"title":"OEM Integrated Valve \/ Flat Cut Gloss Carbon Fiber (82mm)","offer_id":54913183383895,"sku":null,"price":2584.32,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1038\/4575\/7271\/files\/8200CG_FlatCutGlossCarbonFibre_102mm-2_1946x_394740de-4217-4859-b96b-6649f6839982.png?v=1788713847","url":"https:\/\/cuzracecars.com\/products\/stone-exhaust-bmw-n55-f20-f21-m135i-cat-back-valvetronic-exhaust","provider":"Cuz Race Cars","version":"1.0","type":"link"}