take about a second off your 1/4 time and add about 10 mph to your trap. i ran a 13.7@100 off the bottle and 12.7@110 on street tires on a 100 shot in my old fox
My 94 with 100% stock longblock K&N, pullies, 3.73's, MSD digital6+ (for taking out timing), Flowmaster catback, and shifter ran a 14.3 at like 97-98mph with a 2.0-ish 60ft. On a 125 shot with the exact same setup it ran a 13.1 @107 with a 1.9 (spinning BADLY)60ft. Both on street tires, Bridgestone Potenza re910's with 25lbs of air in them.