I raced my friend's manual one at the track. No mods and my mods are in my sig (counting the wheels, my car probably isn't faster than stock though). Anyway, I beat him by a couple tenths with probably a 2.4ish 60ft, so my money is on the stang from a dig. I pulled on him through 60 or so, then it evened out and he began to pull on me by 75 or so. So, from a high-speed roll it could be close. However, that stang has more mods than me and the Bimmer is an auto, so who knows... we only went to 90 since we were on the track. Good luck and take it to the track.
and for a real answer, I gaurantee the bmw would win on the highway. And i bet it would win in the quarter. When i was running a high 15 i got took by about 4 lengths by a 328i by 85mph.