I'm sure the 330 can make 400 whp. But why boost a 330 when you can get an E46 M3 and get to 400whp probably for less money than it would to get a 330 to 400whp?
Not to mention that an M comes with an LSD and upgraded suspension components from the factory.
Honestly, I should have just gotten an M3 from the beginning...I would have saved a LOT of money.
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red