Heh nice A/F line. I'm sure that M3 was stock and here is why.
333 hp @ 7900 rpm
262 ft-lbs @ 4900 rpm
While SIpimpin is making
298WHP@8000rpms
201TQ@6800 rpms
Assuming the M3 is making 280-285WHP and 240-225TQ and both cars with no xtra weight in them I can see the civic pulling 1 1/2 cars on the M3.
Edit: What psi are you running??