Couple of guys have these in their Amarok's, one has been in for a couple of years now. The other came from one of our regular subbies who sold his Rok and bought an LC200. He also bought a 'Chip my Diesel' chip for his cruiser.
The Roks are a bit more zippy but more noticeably is the big drop in consumption, from low 8's down to low 6's for the same trips.
Cheers
Brendon