Well, with bolt ons that doesn't really apply because the power gain is moreso just removing stock restrictions. But what would you do to get above your current 316 rwhp, since you are all out of bolt ons? Therin lies the problem with having a tiny engine, once you get to a point you have to sacrafice power somewhere else when you want more. So you can increase displacement, add forced induction, or use higher flowing heads and bigger cams to revv the piss out of what you've got for highend power. Or, if you can afford it, do all three haha.