Evan Smith drove the stock 2006 to a 13.3 (http://forums.stangnet.com/681926-13-352-103-09-new-stock-06-a.html). And, at the time, the best you could get was 300 HP and 3.55's. With the new set-up (only being a coupe of pounds heavier), with 315 HP, 325 TQ, and optional 3.73's; I believe 12.8...