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JCW GarageInterested in John Cooper Works (JCW) parts for your 2nd Generation MINI? This is where JCW upgrades and accessories for the MINI Clubman (R55), Cooper and Cooper S (R56), and Cabrio (R57) MINIs are discussed.
I am sure it did boost the hp. By how much I really don't know I haven't had my butt dyno calibtrated in a while. You can definately feel an increase though. You can better hear the turbo spool now.