My buddy has a 1994 bmw 325I and he wants to me change out his spark plugs. It has the I6 engine it. Where exactly are the plugs? Now are there wires and a cap and rotor or is it direct spark? Do I remove the cover that has the BMW insignia on it? And really are these plugs a pain in the ass? I've done plugs before and haven't had much of a problem, but i know german cars can be a pain. But any help is appreciated.