are cam gears and headers specific to each car, each engine, do thinbgs like camgears is it fits an ls will it fit all ls's? etc. like would i be able to put a jdm type -r header on my b18a?. might spound like a stupid question but i see people advertise stuff for all b series engines meaning gsr and ls then some sat its just for a b18, b16a etc. i missin somethin can some one clear this up for me