Uprated Rooster Racing Bypass Valve This is known

This is known

This gives sharper throttle response and will keep the boost pressure  your supercharger set up makes going into the engine - where it matters

It is a pretty much neglected part

That fact alone is why I consider the bypass valve as something that should be replaced as part of keeping your engine running as it was meant to

Now Mini did try an ECU tweak on the later models but even that is not going to work

Uprated Rooster Racing Bypass Valve This is knownThe bypass valve is a very important part of the supercharger air flow system. It is a pretty much neglected part, as it is small and not very glamorous looking. However inside the valve is a rubber diaphragm and small conical spring that is vital to its function. Over time the spring weakens and when you change gear or simply close the throttle you may find a slight flutter or hesitation in the engine revs. This is known, in the R53 Mini world as Yo