are very proven. We have at least a dozen local guys running RPS 6 pucks and RPS segmented flywheels at the track and most are running 1.6 sixty foot times. We even have Mike (WXY) running 1.5 sixty foot times with his 94 stock turbo Z with the RPS Max Six puck and RPS flywheel. He goes to the track often and the set up is holding up well to his 7000 RPM launches :) (AMAZING)