Grand National, however easy unfortunatly does not mean cheap, although to run 12's in one is about the easiest, considering it was a 14 sec car in stock form. Tires, Race gas, adjustable wastegate rod, AFPR, and a scanner to somewhat tune and you well into the 12's, for about $400 if that. To go much faster though will cost you to do it right. Although one guy did all the above and added a TE60 turbo and a small nitrous shot from a kit he had laying around and ran 11.5's, the turbo didn't last long though. I will have to check my reciepts but I got about $6,000 into my car and I am nearly not done yet, my guess would be that total investment when I am done will be close to $15,000.
Ohh and my $6,000 does not include the almost $4,000 in parts that came with the car, so if you want to add that in I got $10,000 and have about another $10,000 to spend.