Oh I track my car all the time. I just wanted a dedicated platform since I have 184k mi on mine. The chassis is fine but the engine is getting tired. Maybe it just needs a head rebuild. The 328 and later model high output N52 have the plastic valve cover and MSV71 ECU. 325/330 or any older N52 has the magnesium valve cover and MSV70 ECU. The MAFs are different too. I think the later model N52s use a digital one vs an analog one.
'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