who gives a toss, the man will have sold his tuned diesel by the time any serious miles are on the clock and moved on to a mk5. by which time he will have had his fun,(which i would have thought would be a lot of fun with that bhp in a diesel) and then some other mug who is paying a lot less for it second hand can pick up the repair bill later on. so come on live a little, buy it use it and deal with the consequences later, live for today and sod tomorrow, cos when GPS speed cameras come in in 8 yrs time we won't be able to have cars like these.
Forced induction is the way to go, look at the torque level of a small capacity diesel to that of a big old petrol guzzling technologically out of date V6.