It depends on the exhaust tips on the diesel bmw's if it was a twin on one side could be a 325 or 330d if it was a oval shape could of been a 316 318 or a 320d at that ages all of which have different maps.

I'll throw a D3 into the mix, just for a laugh. Would have been fairly easy to spot though, from the big wheels to the different front spoiler.

Yep i've been pasted by a 330d. No chance, it would be a 320d, Its all down to the driver as its about 10bhp in it.