I thought it was a Gemballa Avalanche because of the side strakes, but the back end is all wrong and the taillights are too (along with some other stuff, after looking up pictures). It's a slantnose though, so it's one of the many slantnose conversion body kits (it's definitely not one of the less-than-1000 factory 930 slantnoses). The taillights are from a Porsche 944.
Anyway, it's a Porsche with an aftermarket body kit.