The comparable Valair would be part number NMU60DDS. It is a sprung hub dual disc w/ ceramic facings. I'm running that clutch in my truck right now. I have about 13k miles on it and it's working fine. It is my daily driver and I have no issues driving in traffic every day or pulling trailers. It is a little jumpy backing up a heavy trailer, but not too big of a deal. I didn't break it in properly, but I've done probably 30 or so launches at the drag strip, about 15 launches in 3rd @ 4000 RPM between burn outs on the street and launches at the track. It just takes the abuse and keeps going.