here's a dyno sheet right here, 2000 miles off the showroom floor!
http://cmw.ne.client2.attbi.com/Cobra_Page/
problem is, people dyno them like a few hundred miles off the floor, its not completely broken in, and you wont reach max hp until its fully broken in..
like i saw a dyno graph of one with 500 miles and it only dyno'ed at 350 whp!! then at 2000 miles and a few mods he had well over 400 whp..
you hit it on the head though, you cant get any grip and driver skill can only do but so much!