Stone Exhaust
Stone Exhaust MINI Cooper S B48/B48E Valved Cat-Back | F55 F56 Hatch & F60 Countryman S | Valvetronic Switchable Sports Exhaust | Plug & Play OBD Valve Control | OPF/GPF Compatible | No Drone | Dyno-Proven Power Gains | Performance Backbox Upgrade
Stone Exhaust MINI Cooper S B48/B48E Valved Cat-Back | F55 F56 Hatch & F60 Countryman S | Valvetronic Switchable Sports Exhaust | Plug & Play OBD Valve Control | OPF/GPF Compatible | No Drone | Dyno-Proven Power Gains | Performance Backbox Upgrade
Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.
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Stone Exhaust switchable cat back for MINI Cooper S B48 and B48E | F55 F56 hatch and F60 Countryman S
Make 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.
We 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.
Key reasons enthusiasts choose this system
- Switchable valves for quiet or sport sound at the touch of a button
- OBD port control unit with ON, OFF and AUTO modes for RPM-based valve behaviour
- Flow-optimised, one-piece layout for excellent gas velocity and durability
- Drone-free cruising and a deep, sporty tone when you want it
- Developed on the dyno for measured power and torque gains
- OPF and GPF friendly design with a free OPF delete module option for OPF-equipped cars
- Exact-fit installation thanks to 3D scanning and reverse-engineered geometry
- Advanced fabrication with 7 axis CNC bending and precision welding techniques
How the valve control works
The 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:
- ON – valves open for maximum soundtrack and flow
- OFF – valves closed for a refined, neighbour friendly drive
- AUTO – the system opens and closes by RPM that you define
Proven performance on the rollers
- Power gain: +7.1 PS at 5,197 rpm
- Torque gain: +6.86 Nm at 4,303 rpm
Real gains you can feel in the mid range with crisper throttle response and stronger pull.
OPF and GPF compatibility
Running 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.
Engineered for performance and longevity
Stone 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.
What you will notice on the road
- Genuinely adjustable volume with the valves
- Deeper tone without motorway boom
- Smoother, quicker revs thanks to improved flow
- Factory-quality fitment on hangers and joins
- Premium build that stands up to daily use
Vehicle fitment
- MINI F55 Cooper S 5 door hatch – 2013+
- MINI F56 Cooper S 3 door hatch – 2013+
- MINI F60 Countryman Cooper S – 2017+
- Engine codes: B48 and B48E
Installation and fitting support
The valve controller plugs straight into the OBD port for a fast, tidy install. Professional fitting of the cat back assembly is recommended.
Want it fitted by specialists We can supply and install at MJ Modifications in Warwickshire. Request a fitting quote: info@mjmodifications.co.uk.
Warranty
Backed by a 2 year Stone Exhaust warranty.
Part numbers
- AP510S – B48 engine
- Ap510GS – B48E engine
Installation video
In the metal
R&D and 3D scanning
Reverse 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.
7 axis CNC bending
State of the art bending achieves excellent roundness and minimal outer bore wear even at tight angles, preserving smooth gas flow and dimensional accuracy.
Welding quality
High heat sections are reinforced with wider, deeper welds using overlapping and crisscross techniques. Mechanical spot welding arms deliver consistent penetration for strength and longevity.
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