The factory engine uses a bypass valve to bleed off excess boost during throttle transitions. The factory unit is made from composite plastic which can be fragile on modified engines or in warmer climate. The Boost Bypass Valve Upgrade is an upgraded bypass valve that is made from alloy and uses a piston instead of a diaphragm.

Fits the following Cooper S models with the N18 Engine:

2011-2013 R56 Mini Cooper S Hatchback
2011-2014 R55 Mini Cooper S Clubman
2011-2015 R57 Mini Cooper S Convertible
2012-2015 R58 Mini Cooper S Coupe
2012-2015 R59 Mini Cooper S Roadster
2011-2016 R60 Mini Cooper S Countryman
2013-2016 R61 Mini Cooper S Paceman

And JCW Cooper S models:

2013 R56 JCW Cooper S Hatchback
2013-2014 R55 JCW Cooper S Clubman
2013-2015 R57 JCW Cooper S Convertible
2013-2015 R58 JCW Cooper S Roadster
2013-2015 R59 JCW Cooper S Coupe
2013-2016 R60 JCW Cooper S Countryman
2013-2016 R61 JCW Cooper S Paceman

The most common complaint on the OEM solenoid valve is a split diaphragm preventing the valve from opening fully, or not at all. This doesn’t always result in a check engine light as the valve can still be blown open by the boost pressure. We have seen many valves with this problem. The other problem is that diaphragm retaining ring is made from very thin plastic that goes brittle with heat cycles, and eventually fails. This prevents the diaphragm from sealing with the same problems as mentioned above. This particular failure also results in the valve falling apart upon removal from the turbo, though in extreme cases bits of plastic can enter the turbo and destroy it. (see image below).

Our alternative is a fully engineered solution offering both significantly improved reliability .Our valve is piston based , with no diaphragm to fail, and of all aluminium construction, it replaces the original unit with a pressure/vacuum operated piston valve that still also retains the desirable OEM ECU control over valve actuation. The valve has been proved on the VAG scene for many years. The spring is interchangeable for different levels of boost, and the solenoid is plug and play with the wiring harness which is included.

NOTE: Some states (like California) have ever tightening requirements for emissions testing and inspections. Always check your current state regulations on compliance for street use before you order.

MINI Boost Bypass Valve Upgrade - recommended for the MINI Cooper S with increased boost and for unmodified MINIs in warmer climates. For the Cooper S with the N14 engine.

The factory engine uses a bypass valve to bleed off the excess boost during throttle transitions. The factory unit is made from composite plastic which can be fragile on modified engines or in warmer climate. The Boost Bypass Valve Upgrade is an upgraded bypass valve that is made from alloy and uses a piston instead of a diaphragm.

Fits the following Cooper S models with the N14 engine:

2007-2010 R56 Cooper S Hatchback
2008-2010 R55 Cooper S CLUBMAN
2009-2010 R57 Cooper S Convertible

The most common complaint on the OEM solenoid valve is a split diaphragm preventing the valve from opening fully, or not at all. This doesn’t always result in a check engine light as the valve can still be blown open by the boost pressure. We have seen many valves with this problem. The other problem is that diaphragm retaining ring is made from very thin plastic that goes brittle with heat cycles, and eventually fails. This prevents the diaphragm from sealing with the same problems as mentioned above. This particular failure also results in the valve falling apart upon removal from the turbo, though in extreme cases bits of plastic can enter the turbo and destroy it. (see image below).

The alternative is a fully engineered solution offering both significantly improved reliability .Our valve is piston based , with no diaphragm to fail, and of all aluminium construction, it replaces the original unit with a pressure/vacuum operated piston valve that still also retains the desirable OEM ECU control over valve actuation. The valve has been proved on the VAG scene for many years. The spring is interchangeable for different levels of boost, and the solenoid is plug and play with the wiring harness which is included.

NOTE: Some states (like California) have ever tightening requirements for emissions testing and inspections. Always check your current state regulations on compliance for street use before you order.