getting back on topic...
I'm with the turbocharger suggestion.. diesel engines LOVE turbines. There's a reason why the previous owner removed the darn turbo.
Oh, and you might want to stick that ***** in your exhaust, might give you a bit more compression in the exhaust outlet. (not all straightflow pipes are beneficial. Don't believe? remove it and try a test. Sure, it SOUNDS fast, but your time drops like a mofo...)