Just to add to what daytrader stated, the Dinan tune alters some 2000 lines of code affecting the whole gamut of ecu controlled processes.Many a tweak other than turbo boost is being
accomplished. Now as to doing it yourself etc..ahh-with a $60000 car, I'd rather it done correctly. Hey, I drive-I appreciate the expertise of those who fix(or enhance).
Not to say I wouldn't put in a jb product myself-but I was pretty happy to have tweaked an already awesome as is.. . coupe with an intact warranty* (as per Dinan etc)
To each their own. I wasn't looking for a racing car-would have gone another route if I were.
M Sport,Dinan stage 2 software-stage 3 suspension,Nav,Audiophile, 6spd man.PSS's BMW P.E.