engine code (not sure with out lookin but im bedridden and cant get up at mo!!) and the earlier 150's are drive by wire (throttle cable) and the later 180's are non drive by wire (so no throttle cable, you have a servo on throttle housing insted)
Gaz
vicky verky........the cable is non-dbw, the potentiometer is the dbw.
The 6 speed is a lovely box

and IMO the 180 is a better drive than the 150, having owned both, and the lump is very responsive in standard form. Re-mapping the later engines can give you more than the earlier lumps, but the earlier engines can also take more because they had slightly stronger internals as they were very over-engineered.