I was wondering for those who either have had experience or have a reliable source for the info. have ran a CR of approx. 11.5-7 on 91 octane (Cali folks)? My Gsr head is milled .030 and I'm debating whether I should use the US or Jdm R pistons. Im not too sure what my CR is currently (many members on this board give different numbers from 10.4 to 10.8 from a .030 mill...) so who knows, but if I were to run Jdm pistons it would be 11.4 or 5 then I'm not sure what that .030 would raise it up to. Also anyone know if this runs into clearance issues? Sorry for the long post, I'd like to make sure before ending up doing something regretful.