That V10 is an incredible engine. A guy in the US had a company install one into a E30 M3 (link below) along with a complete rebuild of the car with uprated components, so much so that only the shell was original. The cost is estimated at $100k, but the craftmanship is outstanding:
http://forums.vwvortex.com/showthread.php?4515333
There's also another nutter who's installed the same engine into a E30 M3 and posted a few races on YouTube to show how quick it is. Here it is wasting a 911 GT3 RS - look at the difference between the 2 cars!
[video=youtube;HiRaJaJK_dw]http://www.youtube.com/watch?v=HiRaJaJK_dw[/video]