And there's the guy with the V6 Coupe putting in a second V6 in place of the rear seats, for true four wheel drive and masses of power. No Coupe Club lynching for him either

The insurance for a complete re-engine job would be a real nightmare though; it'd be a real kick to the groin to buy the car, the engine, and transplant all the bits across, and to fire it up and for it all to work, only to be told by some greasy insurance arse-face that you owe them an arm and a leg before you're legally allowed to use it, even third party only.
The 2.2 HDi is a good engine and, with a little bit of work, can be made to be super-quick (all that diesel torque!) and economical to run.