has any one experience with these...i'm bout to pick it up for my sohc from some local guy that sellin it and he sed that its either 58mm and gets bigger to 60mm or 60mm and get smaller to 58mm diameter....i have a skunk2 im....any info on the jg t/b would be a PLUS....i check their website out but there were none SOHC t/b on there....so i thought i ask u guys....so leave wut ya know...thanks