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well...the R56 S's are Turbocharged. As for the non S's, if you only got 20-30 horses out of any kind of Forced Induction then it's a terrible piece of gear. Depending on boost levels you should see much larger increases.
Uhhh... the R56 is a completely different beast. The non S cooper could have more potential due to the valvetronic setup which is really cool. I imagine when a supercharger or turbo comes out for it, it will be WAY over 20-30hp difference.