The instructions for my new Wiseco piston say additional ring gap clearance is neccesary for aftermarket pipes,blah,blah,blah, but doesn't say how much. They reccomend .004 per inch of bore, which in my case is roughly .011 (.40 over). The manual says stock is 8~14. I'm thinking about runnin with .013 for sh#ts & grins. Whadda ya think?