i just ran a 9.69 at 140+ with a 1.39 60ft on et streets at dragway 42 which prosport calls the worst track in ohio !!! i like my cal tracks they are real easy to in stall and adj ! bottom hole 1/8 turn preload on the right just touching on the left shocks on 7 ive got 800.00 in everything !!! and u will have to gusset the spring pads !!! mine tried to roll them off of the housing !! hits hard/ :drives nice as super stocks on the street !!