mine is standard and i have had it to 150 on the clock. I was about 3 foot away from the back of a newish 'vette stingray though. (all on a private track of course) bet he was p*ssed tho, i would be getting about 20 times his mpg!

I think you will find that it wont rev past 4300 in any gear as the engine wont breathe that well plus the mapping/fuel systems wont let it - its a diesel engine THEY RUN BIG PARTS INSIDE AND DONT REV HIGHLY. If mine revved out in top it would be reading about 145 - it does 3k at a ton - it wont go past the limiter even when mapped unless it has the fuel system and limiter modded - but then it will be potential short engine life I would expect - laws of physics, etc... if you have the power you will then have to play with gearing to increase the top end speed, either in the ratios in the box or in the final drive. But why anyway? the gearing is tall as it is, just benefit in the improved accelleration.