You should consider the 325i sedan, with some relatively minor replacement engine parts, you'll have yourself a 330i. :shhh:

Major parts shared by 325i + 330i

1) Engine block
2) Oil Pan
3) Engine Head
4) Inlet Cam
5) Exhaust cam
6) Connecting Rods
7) Pistons

Parts NOT shared
1) ECU
2) Intake system
3) Clutch
4) Differential