I bought a turbo engine and was told it was a from an s5. is there a way to tell it is an s5 turbo engine without tearing it apart? i am thinking it is an s5 because of the A/C pump that was on it.

 

i could tell if it has a electric metering pump but if somebody could get me a picture of that then i will know for sure.

 

If you can look at the top of the rotor housings, the s4's had writing on them that said HIROSHIMA or similar (where they were manufactured). The s5 housings also have a tiny threaded hole above the spark plugs for the knock sensor. Also, if you look on the throttle body, there should be two throttle position sensors. And the OMP is down by the bottom of the waterpump just behind the pipe that goes to the lower radiator hose.