If you have a 328, it might not be worth it. If you have a 325 the difference is huge. I noticed immediately when it was erased. The torque is what I really does it for me.
'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