I saw this late last week. Looks like a good option for buick. Brembo's, Recaro Seats, awd, turbo, and a 6sp sound like a great combo! I dunno if i would call it a evo/sti fighter, not enough hp and too heavy... but A4/S4, S60R, SHO fighter I can see.
The car is an Opel Insignia OPC the only difference is that in europe it has a turbo V6.
+1 on more cars being make AWD!
this link has some better info and more pictures...
http://www.autoblog.com/2010/01/07/b...ishield-brand/
http://www.autoblog.com/gallery/buick-regal-gs-concept/