Actually more than one. Is it worth upgrading a 2012 sho style supercharger clutch to the newer style 57 tooth? Is the R&D tool needed if you change the gears and clutch set to new style. And if just the teeth on clutch are bad should just it be changed?? Or since I've got sc off should I change the whole set?? Many thanks I'd rather have your opinions than any other>Marvin