has anyone on here upgarded there cam shafts? was just curious. some of them from this site http://www.intengineering.com/Cat-Ca.../sc262362-1-2/ have some interesting options. some of them produce more power at top end which could be usfull, while im guess at a sacrafice to low end torque, which could help with wheel spin. any thaughts? oh and incase people are wondering i know ther for mark 4 golfs but id asume the 1.8t cam shafts would be similar/same.