Ive driven the Jaguar XJR (supercharged, 390 hp, 4 door) and according to road and track that is faster than the AMG. My mom bought the XKR (2 door, 390, lighter). I killed a Cutty, Firehawk, and GT 5.0 with it around town. Idea, my GN vs. XKR. I was in the XKR and my buddy was in the GN. The GN stayed at the rear quarter of the Jag. I was so happy my $12,000 car ran with a $90,000 Jag. 18 psi in the buick, many mods since then. Dont be too scared.
Nick
Nick