i have a 1994 audi s4. the car is currently equipted with a turbo. however, i feel that a larger higher boost turbo could certainly make the care more spirited. i was looking at the garrett gt32 and the gt28rs turbos. however im not sure if these will fit onto my car. according to garrett's graphs i determined that these two would work on my 2.2 liter engine. im not sure how determine if the fittings are correct. how might i be able to tell. also, when dealing with turbos, what do trim and A/R measurements mean? i would appreciate any help.