A lot of it will depand on how good of a driver you are. Just because you may have done well before the Zex, doesn't mean you'll do so hot now that you have it...It will be like learning to drive a whole new car again since you get an extra 75 HP in just a couple seconds. If all goes well and you get some runs in before you go I would guess that you would be getting around the low 15s. Have Fun