Their night and day difference you have to get a manifold to get the best from them
I only got one as my GT30 shit itself so it suited at the time the pick up is unreal more torque/ power it's a win win as far as I'm concerned if I keep this engine at the same spec I might be tempted to change to a slightly small Borg Warner for more response as there's a new one which will flow 500hp but picks up quicker but for the best advice you better of calling Mark