you have a m20 that's easy then it goes onto a nipple on the bottom of the throttle body (at least on usa cars)

Quote Originally Posted by Black530i
OK.. Thanks.. The problem, however, is that I can't find any vacuum spot I can attach it to. Should it attach to the gas house ? Or to the rubber hose in between the air-meter and the gas house ?

The car doesn't seem to run any different, so perhaps the previous owner made some modification such that there is no more vacuum spot to connect it at ?

Ed