Stu and nick actually did the test, using nicks 330d mapped by us at 300bhp with around 470lb/ft and it was just as fast as stus M5 to 100 mph, there was absolutely nothing in it.
The dervs need a good intercooler to keep the charge temps down to make them work really well.

It amazes me how quick they are, my 320d is around 250bhp with close to 400lb/ft its damn fast to 150mph and its so effortless, awesome cars.
they take all the abuse you can give them, they will sit flat out hour after hour and you still don't need to open the bonnet between services