i have a 99 f150 rc with a 4.6 5spd. last week i went to the track and ran a 15.1 on street tires. i have a hypertech, homemade intake, and 373 gears. i was cutting a 1.9 60ft, which i couldn't beleive, and a 9.4 8th mile. im only trapping at 85 but thats ok with me. i want to break 14s real bad and plan on getting underdrive pulleys with efans. just wandering what to gains could i expect. i also had a 40 pound speaker box with a half a tank of gas. so i know im in the 15 flat area. thanks

 

Throw some slapper bars under there. Lakewood makes a set for under a 100 bucks. Throw some DR's on the back as well. You'd easily break 14's if you could cut a little more off your 60 ft. I gotta say, that's respectable on street tires.