i had 4.30s in my car for some time when the car had a tremec in it. 1st gear is preety much useless. you dump the clutch to leave and immediately have to power shift to 2nd almost like a double clutch 1st gear was so short. when i stepped up to a big shot nitrous kit i was running out of gear before the quarter mile. 4.30s and up are really better for naturally aspirated cars but suck for power adder cars. im now running 3.90s and love the gear. i might even go to 3.73s or 3.55s in the future if i start getting crazy with the spray.