{"product_id":"stone-exhaust-bmw-n26-f22-f23-230i-cat-back-valvetronic-exhaust","title":"Stone Exhaust AP525B BMW 230i B48 2.0T (F22\/F23 2015+) Valved Cat-Back Performance\/Sports Exhaust | Switchable Valve, OEM Flap Control | Catback Twin Exit | BMW 2 Series Coupe \u0026 Convertible, xDrive Compatible","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \u003carticle class=\"unreset\" data-scroll-scope=\"\"\u003e\n    \n    \u003ch2\u003eStone Exhaust AP525B for BMW 2 Series 230i B48 F22 F23\u003c\/h2\u003e\n    \u003cp\u003eUnlock a richer soundtrack and sharper response from your BMW 230i with Stone’s switchable sports system. This premium cat back upgrade retains factory flap control for quiet cruising and an authentic performance tone on demand, delivering a deeper note with no cabin boom, quicker throttle reactions and proven dyno gains. Built for everyday use and weekend blasts, it is the ideal sound and performance enhancement for B48 powered F22 and F23 models, including xDrive.\u003c\/p\u003e\n    \n    \u003cp\u003eAt MJ Modifications we have installed multiple Stone systems on customer 2 Series builds, and the feedback has been consistently positive. Fitment is precise, the finish is superb and the driving experience feels more alive without compromising daily comfort.\u003c\/p\u003e\n    \n    \u003ch3\u003eKey reasons to choose this upgrade\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003eFactory ECU controlled exhaust flap for genuine quiet and sport modes\u003c\/li\u003e\n      \u003cli\u003eRefined motorway manners with no intrusive resonance inside the cabin\u003c\/li\u003e\n      \u003cli\u003eSportier tone under load with a clean, aggressive bark when you press on\u003c\/li\u003e\n      \u003cli\u003eDyno developed for measurable performance improvements\u003c\/li\u003e\n      \u003cli\u003eSingle piece layout for strength, optimal flow and a straightforward install\u003c\/li\u003e\n      \u003cli\u003eEngineered from detailed 3D scans for exact BMW fit on F22 and F23 platforms\u003c\/li\u003e\n      \u003cli\u003eHigh precision welding and robust construction for longevity under heat\u003c\/li\u003e\n      \u003cli\u003eOptional Stone Valvetronic add on available for manual valve control\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003ch3\u003eSound control options\u003c\/h3\u003e\n    \u003cp\u003eBy default the valve is managed by your car’s electronics, mirroring the factory behaviour. If you prefer manual control, add the Stone Valvetronic single valve kit with a plug in OBD controller and remote handset for instant open or closed operation from the driver’s seat.\u003c\/p\u003e\n    \n    \u003ch3\u003eEngineering that elevates your 230i\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e3D laser scanning and reverse engineered geometry to optimise pipe sizing, routing and bend radii\u003c\/li\u003e\n      \u003cli\u003eFlow, thermal and pressure simulation to maximise performance and reliability\u003c\/li\u003e\n      \u003cli\u003e7 axis CNC mandrel bending with up to 98 percent roundness and 0.025 mm tolerance to reduce turbulence\u003c\/li\u003e\n      \u003cli\u003eOverlap and cross welding techniques for excellent penetration and durability\u003c\/li\u003e\n      \u003cli\u003eRobotic spot welding for consistent, repeatable quality at every joint\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003cp\u003e\u003cimg alt=\"Stone Exhaust 3D Scanning and Reverse Engineering for BMW 230i UK\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/1_9336c8b0-c9ea-4822-891c-83490f630707.jpg?v=1572705528\"\u003e\u003c\/p\u003e\n    \u003cp\u003e\u003cimg alt=\"Stone Exhaust 7 Axis CNC Bending - Precision BMW 230i Catback\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending.jpg?v=1572739395\"\u003e\u003c\/p\u003e\n    \u003cp\u003e\u003cimg alt=\"Stone Exhaust Welding Quality - BMW 230i F22 F23 Catback\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_1_1024x1024.jpg?v=1572828150\"\u003e\u003c\/p\u003e\n    \u003cp\u003e\u003cimg alt=\"Stone Exhaust Direct Spot Welding - BMW 2 Series 230i\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_2_1024x1024.jpg?v=1572828178\"\u003e\u003c\/p\u003e\n    \n    \u003ch3\u003eCompatibility\u003c\/h3\u003e\n    \u003cp\u003eBMW 2 Series with the B48 2.0 turbo engine:\u003c\/p\u003e\n    \u003cul\u003e\n      \u003cli\u003eF22 230i Coupe 2015+\u003c\/li\u003e\n      \u003cli\u003eF23 230i Convertible 2015+\u003c\/li\u003e\n      \u003cli\u003eF23 LCI 230i xDrive 2016+\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003ch3\u003ePart number\u003c\/h3\u003e\n    \u003cp\u003e\u003cstrong\u003eAP525B\u003c\/strong\u003e  requires M140i or M240i rear bumper.\u003c\/p\u003e\n    \n    \u003ch3\u003eWarranty\u003c\/h3\u003e\n    \u003cp\u003eBacked by a 2 year Stone Exhaust warranty.\u003c\/p\u003e\n    \n    \u003ch3\u003eProfessional fitting\u003c\/h3\u003e\n    \u003cp\u003eFor a hassle free installation and perfect alignment, book your fitment 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 terms enthusiasts use\u003c\/h3\u003e\n    \u003cp\u003eBMW 230i sports exhaust, BMW 2 Series 230i performance system, F22 F23 230i B48 exhaust upgrade, switchable valve exhaust for BMW 230i, factory flap control exhaust, quiet on cruise loud on throttle, drone free BMW 2 Series exhaust, BMW 230i xDrive compatible exhaust, performance cat back for B48, BMW 2.0 turbo exhaust system, Stone Exhaust AP525B UK, twin exit 230i exhaust, coupe and convertible exhaust upgrade, BMW 230i sound upgrade, Warwickshire fitting BMW exhaust, MJ Modifications BMW specialist.\u003c\/p\u003e\n  \n  \u003c\/article\u003e\n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"OEM Integrated Valve(s) \/ Flat Cut Gloss Carbon Fiber (82mm)","offer_id":55977892381058,"sku":null,"price":2112.96,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/8200CG_FlatCutGlossCarbonFiber82mmExhuastTailpipes_1946x_7924fe38-321c-40a5-adc4-fe7fbabb2d1d.png?v=1763377190","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-bmw-n26-f22-f23-230i-cat-back-valvetronic-exhaust","provider":"MJ Modifications","version":"1.0","type":"link"}