* BMW 330i: Uses a turbocharged 4-cylinder engine (B48) with a displacement of 2.0 liters.
* BMW 330xi: Uses the same turbocharged 4-cylinder engine (B48) with a displacement of 2.0 liters as the 330i.
The main difference is that the 330xi has all-wheel drive (AWD), while the 330i is rear-wheel drive (RWD).