You'll be better off spending your money on a mini cooper supercharger like this one http://cgi.ebay.co.uk/bmw-mini-cooper-s-supercharger-rally-corsa-saxo-astra_W0QQitemZ260171060931QQihZ016QQcategoryZ100916QQssPageNameZWDVWQQrdZ1QQcmdZViewItemBut then, you need to upgrade engine components so they can deal with the extra stress and heat. Would be worth it in the long run if you have the time and money