So it is not because of the more restrictive Catalyst Converter for the U.S. Spec models?? I thought that was the case for E46 M3s.
1. E90 325i/328i/330i Eisenmann Race Exhaust 2 x 76mm (Used for 30000 miles) $680 OBO
2. E90 M3 Jet Black Front Bumper $120 OBO
3. E90 M3 Style CF Trunk Spoiler $80 OBO