JCW's are 100% not 14.5 reduction, they are 11%. on 2005 onwards anyway imo
I know this as there John Cooper 225 HPD kit isnt even 14.5% Why would they design a 225kit with a bigger pulley(hence less boost)??
The one i measured in my hands and roland from GTT was 11% smaller!! I think there has been some confusion from they way people have actually been measuring them, the only way is with the pulley in your hands with a pair of vernier calipers, not on the car with a tape measure
