Easy cheesy.
Does it lok more like (1) or (2)
(1) e36
(2) e46
The first is an e36, the second is an e46. Dont mind the body styling, just lok closely to see if its more boxier like the e36 or rounded like the e46. Look closely at the hoods/grills/headlights and that will be the easiest give away for members who arent conossiuers of BMW.
Oh yeah, and welcome to bimmerwerkz. Stick around, its a fun place