[CarlosM4]

What is the difference in the B48 engine in the 330i vs 320i?

Interested as I bought a 320i M Sport and plan to tune it into 330i power.

[bquatt]

Originally Posted by christians g20

The G20 330i is a B46 2.0 L Twin turbocharged 4 cylinder engine. The 320i is a 2.0 TwinScroll 4 cylinder. The twin scroll turbo is a single turbo powered from pairs of cylinders in an alternating sequence from two exhaust down tubes.

That’s not the case - the 320i is a detuned version of the 330i’s which is a twin-scroll. I believe that the 320i version also has weaker pistons and internals. Or so I was told by a tuner in Holland. Regardless, imagine the 320i would have no issue running stock 330 like power.