i have a 5g Hb with a 97 LS swap...only modifications are a short ram intake...no exhaust....i took it to the track the other day and the best i could get out of it was a 16.045 @ 87mph...im pretty sure that if i ran again i could have broke the 15's....also my tires are pretty bald...am i running what i should be right now, ..and will exhaust and tires put my where i need to be (15.4 area) >?