Maybe the cats are clogged? Floor it a few times to get clean then out. If a bunch of black smoke flys out of the exhaust then you have some carbon buildup in the exhaust.
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here!
| Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors