the thing with the 5.7 is that youre looking at a low 14 to high 13 second car with an auto trans, if the concept weight is the same as the production model. thats just not fast enough for the performance model. i know a guy with a stock s197 mustang with a V6, and with very very little work done, hes in the 14.50s...he has the ford gear upgrade, a CAI, catback, and a tune.