{"product_id":"stone-exhaust-mini-b48-f55-f56-cooper-s-cat-back-valvetronic-exhaust-system","title":"Stone Exhaust MINI Cooper S B48\/B48E Valved Cat-Back | F55 F56 Hatch \u0026 F60 Countryman S | Valvetronic Switchable Sports Exhaust | Plug \u0026 Play OBD Valve Control | OPF\/GPF Compatible | No Drone | Dyno-Proven Power Gains | Performance Backbox Upgrade","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eStone Exhaust switchable cat back for MINI Cooper S B48 and B48E | F55 F56 hatch and F60 Countryman S\u003c\/h2\u003e\n  \n  \u003cp\u003eMake your MINI sound alive and feel sharper with the Stone Exhaust valve-controlled cat back. Purpose-built for cars running the B48 and B48E engines, and a direct bolt-on for the F55 5 door, F56 3 door and F60 Countryman S, this system delivers a deeper note, effortless cruising with no resonance and genuine, dyno-tested performance gains. It is the ideal upgrade for drivers who want a premium sports exhaust with OEM-level fit and finish.\u003c\/p\u003e\n  \n  \u003cp\u003eWe have installed this system and customer feedback has been outstanding. The soundtrack is refined on the motorway yet aggressive on demand, the fitment is spot on and the drivability improvement is immediately noticeable.\u003c\/p\u003e\n  \n  \u003ch3\u003eKey reasons enthusiasts choose this system\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eSwitchable valves for quiet or sport sound at the touch of a button\u003c\/li\u003e\n    \u003cli\u003eOBD port control unit with ON, OFF and AUTO modes for RPM-based valve behaviour\u003c\/li\u003e\n    \u003cli\u003eFlow-optimised, one-piece layout for excellent gas velocity and durability\u003c\/li\u003e\n    \u003cli\u003eDrone-free cruising and a deep, sporty tone when you want it\u003c\/li\u003e\n    \u003cli\u003eDeveloped on the dyno for measured power and torque gains\u003c\/li\u003e\n    \u003cli\u003eOPF and GPF friendly design with a free OPF delete module option for OPF-equipped cars\u003c\/li\u003e\n    \u003cli\u003eExact-fit installation thanks to 3D scanning and reverse-engineered geometry\u003c\/li\u003e\n    \u003cli\u003eAdvanced fabrication with 7 axis CNC bending and precision welding techniques\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eHow the valve control works\u003c\/h3\u003e\n  \u003cp\u003eThe plug in controller uses the car’s OBD port for a simple, no-cut install. Use the supplied remote to choose how your MINI sounds and flows:\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eON – valves open for maximum soundtrack and flow\u003c\/li\u003e\n    \u003cli\u003eOFF – valves closed for a refined, neighbour friendly drive\u003c\/li\u003e\n    \u003cli\u003eAUTO – the system opens and closes by RPM that you define\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eProven performance on the rollers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003ePower gain: +7.1 PS at 5,197 rpm\u003c\/li\u003e\n    \u003cli\u003eTorque gain: +6.86 Nm at 4,303 rpm\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eReal gains you can feel in the mid range with crisper throttle response and stronger pull.\u003c\/p\u003e\n  \n  \u003ch3\u003eOPF and GPF compatibility\u003c\/h3\u003e\n  \u003cp\u003eRunning a particulate filter car There is an OPF delete option supplied free of charge so OPF-equipped MINIs can run this cat back without throwing error codes. No ECU coding is required for this function.\u003c\/p\u003e\n  \n  \u003ch3\u003eEngineered for performance and longevity\u003c\/h3\u003e\n  \u003cp\u003eStone engineers 3D scan the factory system to perfect pipe routing, diameters and bend angles, then simulate flow, temperature and pressure to refine the design. A 7 axis CNC bender maintains roundness through tight radii to keep velocity high and turbulence low. High stress zones are reinforced using overlapping and crisscross welds with direct spot welding for accuracy and strength. The result is a MINI performance system that looks as good as it performs.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhat you will notice on the road\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eGenuinely adjustable volume with the valves\u003c\/li\u003e\n    \u003cli\u003eDeeper tone without motorway boom\u003c\/li\u003e\n    \u003cli\u003eSmoother, quicker revs thanks to improved flow\u003c\/li\u003e\n    \u003cli\u003eFactory-quality fitment on hangers and joins\u003c\/li\u003e\n    \u003cli\u003ePremium build that stands up to daily use\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eMINI F55 Cooper S 5 door hatch – 2013+\u003c\/li\u003e\n    \u003cli\u003eMINI F56 Cooper S 3 door hatch – 2013+\u003c\/li\u003e\n    \u003cli\u003eMINI F60 Countryman Cooper S – 2017+\u003c\/li\u003e\n    \u003cli\u003eEngine codes: B48 and B48E\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eInstallation and fitting support\u003c\/h3\u003e\n  \u003cp\u003eThe valve controller plugs straight into the OBD port for a fast, tidy install. Professional fitting of the cat back assembly is recommended.\u003c\/p\u003e\n  \u003cp\u003eWant it fitted by specialists We can supply and install at MJ Modifications in Warwickshire. Request a fitting quote: \u003ca href=\"mailto:info@mjmodifications.co.uk\"\u003einfo@mjmodifications.co.uk\u003c\/a\u003e.\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\u003ePart numbers\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eAP510S – B48 engine\u003c\/li\u003e\n    \u003cli\u003eAp510GS – B48E engine\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eInstallation video\u003c\/h3\u003e\n  \u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;\"\u003e\n    \u003ciframe src=\"https:\/\/www.youtube.com\/embed\/V5c4VEyO1EM\" title=\"Stone Valvetronic installation guide\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\n  \u003c\/div\u003e\n  \n  \u003ch3\u003eIn the metal\u003c\/h3\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_MINI_B48_F55_F56_Cooper_S_Catback_Exhaust_System_6_2048x2048.png?v=1600763655\" alt=\"Stone Exhaust cat back installed on MINI Cooper S F55 F56\"\u003e\n  \u003c\/p\u003e\n  \n  \u003ch3\u003eR\u0026amp;D and 3D scanning\u003c\/h3\u003e\n  \u003cp\u003eReverse engineering and digital scanning help identify where the factory system can be improved, from pipe diameter to routing and bend profiles. Continuous data collection and simulation inform every design decision for both B48 and B48E variants.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/1_9336c8b0-c9ea-4822-891c-83490f630707_2048x2048.jpg?v=1572705528\" alt=\"3D scanning and reverse engineering for MINI Cooper S exhaust\"\u003e\n  \u003c\/p\u003e\n  \n  \u003ch3\u003e7 axis CNC bending\u003c\/h3\u003e\n  \u003cp\u003eState of the art bending achieves excellent roundness and minimal outer bore wear even at tight angles, preserving smooth gas flow and dimensional accuracy.\u003c\/p\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/bending_2048x2048.jpg?v=1572739395\" alt=\"7 axis CNC bending on Stone Exhaust MINI systems\"\u003e\n  \u003c\/p\u003e\n  \n  \u003ch3\u003eWelding quality\u003c\/h3\u003e\n  \u003cp\u003eHigh heat sections are reinforced with wider, deeper welds using overlapping and crisscross techniques. Mechanical spot welding arms deliver consistent penetration for strength and longevity.\u003c\/p\u003e\n  \u003cp\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=\"Stone Exhaust welding detail\"\u003e\n  \u003c\/p\u003e\n  \u003cp\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0284\/6300\/5795\/files\/Stone_Exhaust_Art_of_Welding_-_2_2048x2048.jpg?v=1572828178\" alt=\"Precision welding on Stone Exhaust MINI system\"\u003e\n  \u003c\/p\u003e\n  \n  \u003ch3\u003eAlso searched for\u003c\/h3\u003e\n  \u003cp\u003eMINI Cooper S sports exhaust, MINI F55 performance system, MINI F56 backbox upgrade, F60 Countryman S cat back, B48 tuning parts, B48E exhaust upgrade, switchable exhaust for MINI, valve controlled exhaust MINI, plug in OBD exhaust controller, GPF friendly exhaust, OPF safe MINI exhaust, UK MINI exhaust upgrade, bolt on exhaust MINI, quiet to loud exhaust MINI, free flow exhaust MINI Cooper S, drone free MINI exhaust, hatchback performance exhaust, road friendly sport exhaust.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"Stone Exhaust","offers":[{"title":"B48 (Non-OPF) \/ Flat Cut Gloss Carbon Fibre (102mm)","offer_id":56006638141826,"sku":null,"price":2427.84,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/Flat_Cut_Gloss_Carbon_Fibre_102mm_1946x_66d701c0-0318-4d8f-a893-75d19a42c47f.png?v=1764059420","url":"https:\/\/mjmodifications.co.uk\/products\/stone-exhaust-mini-b48-f55-f56-cooper-s-cat-back-valvetronic-exhaust-system","provider":"MJ Modifications","version":"1.0","type":"link"}