BMW Z4 is also available with a 197 hp 2.0 liter engine coupled to a six speed manual. This is the probable engine for the new Plus Four.
Harald
To me this would be the most logical as it is far enough removed from the more powerful PlusSix. Also available in 8 speed Steptronic with paddle shift. The 20i has maximum torque of 320 Nm available from 1450 rpm. That should be more than enough to keep things exciting.
The 2 litre 258 hp version, the 30i, is only available in automatic.