I don't understand what the problem is here. He has all the mods needed to get low 13's. Let see. He is pushing around 250 rwhp <----This is a guess Is running about 100 - 150 lbs less then stock a good bit of that is rotating mass (big help) <--- Once again guessing. Next he has an after market torque converter and suspension work to transfer the weight to his stick drag radials. (big help) 13.0 flat no problem with what he has done so get over it. Traction and less rotating mass do wonders for your E.T. If you look at his trap speeds you will see he is just a bit faster then most stock 5spd Stangs. So for all you physics majors out there re work your numbers this does not defy physics.