As a point of clarification, the throttle body was bored by Dinan...nothing else. According to Dinan, the exhaust,CAI and throttle body combined add 15-20 hp and Dinan is notoriously conservative. Activeautowerkes says to expect 15+hp from the software. Ballpark 285-295hp total. I expect that's all there is short of going to internal engine parts which I'm not doing.
As noted, the turbos have much more upside than the normally aspirated 330i. However, experts say the turbos have a shorter life span.
The cost of the Dinan and Active bolt-ons is approx. $6000 for 30-40hp. Not cheap but done right and they are BMW's!!!
Also, I cannot stress enough the ride quality and handling improvement added by the Dinan suspension upgrade. Once again, not cheap but these are BMW's. The handling of my Dinan 3 versus an off the rack 335i's is no comparison,imo.
Thanks. Good Luck. BMW's are AWESOME!!!