Well the thing is i want to keep this streetable its my daily and to be honest i am never really gonna see 4200 rpm in daily driving well maybe but more than likely not . The 64 ar is more suited to me , but right now i have the suction kit , z32 maff and the greddy 02 pipe and the down pipe . I am searching for some 550cc injectors to tune with my super afc and eventually an enthalpy rom burn . Its just i want around 350-380 and from what I am told it is acievable with the .64 and the .86 if it was a highway car .