That is a BBC with twin turbos on it, and yea that is also very cool, but i like this cause it has NEVER been done before.
Its a mid 80's cutlas that came with a diesel from the factory, that was made to look like a GN. The reason he did it is because he lives in So. Cal. and diesel cars aren't checked fro smog.
Here is the thread with all the info about it.
http://www.turbobuick.com/forums/brakes-suspensions-tires-wheels/174554-g-n-hotrod-project.html?highlight=hotrod+GN