I either gonna get the new pro circuit t4 or the big gun complete my parents dont wnat me to waste 320 on the full big gun which isnt a bad deal. How much bigger is the head pipe from stock to the big gun and would it make a whole lot of diffrence. How much power will both give me thanks

 

I have a Pro Circuit and like it alot. I race TT's and it works well for that. I only have the slip on model. I run a 160 main with no airbox lid.

 

Can u tell the diffrence in the pipe and does it sound good