I run a toilet bowl,so changing air input I would have change to change complete tune up,no throttle stops are allowed in this class,car weighs about 2500# with me,taking off in high could be pricey after a while,have tried leaving easier and shifting early,can't seem to find a consistent combo,Iam considering buying another pumkin and starting with maybe a 4.56 ratio and working from there.Hey Lively if I was driving a ford I'd already be running a 5.90.