Originally Posted by ozinaldo
They did not forget the 335is, 335is is a market specific model limited to only US (and UK maybe?) plus 1M and Z4is versions have the highest output of 250 kw/340ps so they considered those two.
The N54 is a twin power in the sense of a bi-turbo set up with two small turbos. The N55 is a single turbo set up but with twin scroll technology.
In Chile we also have a couple of 335is