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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.
If you look at the marketing spiel they don't say anything about a power gain and given what it does there won't be a power gain. All it does is condition the signal from the throttle so that a smaller movement registers as a larger change.
As far as I'm concerned there are far better ways to spend $300+.