What would you do if you had a lottery winning amount of cash to spend on a vehicle, but with the stipulation that it had to be spent on a one-off project as opposed to a regular supercar?

Well a chap in the States knew his answer. Although he wasn't a lottery winner, just a BMW collector with an idea in mind, and, presumably, a small continent in his assets. Built by Piper Motorsports, this has to be one of the highest quality executions of a transplant project ever, the V10 from an M5 into an E30 M3. Complete with full running gear...

The thread isn't new but so good that when I came across it again today I had to repost. Teaser photo below and full thread can be found here.