I have hoosier quick time pros, and e-mailed hoosier for recomended air pressure they said start at 12-14lbs, I went down to 10lbs felt very good on being stable. Jeff or MM with the bad ass chevy II runs 8lbs in his hoosiers, 20lbs seems high, for that slick, I ran dot bfgoodrich radials at 20lbs, to me sounds like to much air in slick.