I took my car out to the track to try my BF Drag RAdials P325/50R15's. I was running 11.60's and my car would usually run 11.50 with MT ET streets so I gave up on them. Later that week I found out my new throttle bracket wouldn't give me wide open throttle. I want to go back and try them again this summer. I can't remember what pressure I was running so you have to experiment with it. Maybe start at 20psi and go down from there. Jysnflem