Originally Posted by chaFT328i
Someone correct me if I'm wrong, but isn't it that 328s in California uses the SULEV engine(AKA N51) which has a 3 stage due to different emissions?? IIRC, only difference is that the 328s are detuned so the 3 stage isn't at its full potential, and that a tune would solve this.
Hmmm +1 to this... I also heard the same but idk either...
The intake manifold part number are the exact same---> 11617559523 (330i) 11617559523 (328i)
I'm starting to love california's emissions law just a little bit