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JCW GarageInterested in John Cooper Works (JCW) parts for your 1st Generation MINI? This is where JCW upgrades and accessories for the Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs are discussed.
Supposedly teflon coating on the vanes (the things in the middle of the SC that spin and create the boost) which helps sealing - i.e. less pressure lost, more boost.
All else equal, better to get the '05+