i need to find out the compatibility of the trans engine and ecu for my ls setup im gonna do. Im gonna start by dropping in a manual trans and i think im goin to go with the b16. So i will then have to get the manual ecu, im pretty sure that means i need a b16 ecu (but im not sure if it will run with the ls motor, fill me in if you know.) later on im goin to want to slap a vtec head on it and i want to know if i will have to get another new ecu cause my old setup was on the ls which wasnt vtec. im not sure how ecu's work and if the b16 ecu can be used for my setup with the ls motor and b16manual trans, and then will it still work if i put a vtec head on. sorry if this seems scatterbrained but im tring to get a grasp on things so i dont have to re-buy parts later on.