ok, I have a 1992 BMW 320I. German Spec. 5 Speed Manual Tranny, its got the 520I engine in it, straight 6 (dont know the actually model of the engine) Just picked this up from a friend of mine thats PCSing (currently stationed in Germany). Pretty sure that its through the throttle body, as its not that loud, and i can feel it in the gas pedal. Currently running 90 octane gas with it.