So here are the mods i should do as you guys have said: Corolla Inlet manifold 50mm throttlebody 4-2-1 exhaust manifold C52/c56 gearbox? Emanage Thin gasket? High cr pistons Any other mods? Some mods i know: large diameter ht leads,irridium sparkplugs,cold air intake. also i want to know if its worthy to ugrade my fuel system....like using walbro,large injector,fuel pressure regulator,braided fuel lines etc...Forgot to mention my current engine is 5efe 1st gen jdm distributor type....so do i still need the corolla inlet manifold as its jdm? And if i need to use 4afe inlet would i be able to use 4ages itb?......correct me if i am wrong anywhere.......