Ok Brad since our OEM IC's generally made NOT to be a performance based after one good run you will get Heat Soaked, with the WAGNER you will have better airflow and hence cooler air for the turbos even after a few runs!!, that said, I suggest you go ahead and either go piggyback a la JB or Flash a la RENNtech as i have. With the WAGNER you will have less HEAT soak though!! My car runs way much better since the inception of the WAGNER during heavy traffic and thus giving me better city mpg than before, mind you, Im kind of a racer though. hope this clears you mindset in getting one its comparably CHEAPER than any 335i IC yes you read that right 335i IC outhere!!
RENNtech Flash(Lenny Wu)/WAGNER IC
Enkei Rajin 18"/Execuhitch Hitch/Koni FSD
Soft Ride Bike Rack/Brava Synthetic Motor Oil(Made in Puerto Rico)/Meth(in the works)/CBU done w Andrew EGR Race Pipe (whoa! what an animal it is now)