Not streetable according to Tilton, although plenty of Supras run them on the street. If your talking about the carbon clutch it's all good, and buy me one too For up to 400ft lbs, I would run an ACT Extreme PP,
Stock disc for street/autocross, and 6 puck for racing. Both with a light flywheel. Carl Byck

 

I had a HKS Twin disk clutch that workde pretty good for a thousand miles, and then I found that the center disk was concave
and making the clutch drag. Called HKS and asked for a new part or warranty and they said no parts available except clutch disks, and they never ever had a problem before. I wouldn't Buy From them again
because of service. GroundZero Motorsports

 

There's always the OS Gilken twin plate...the Japan guys seem to like it better than the HKS unit. Cusco makes one as well (might be a rebadged OS G though)

 

I am happy with my RE-Amemiya twin plate. But all it is a over priced OS Giken with Re-Amemiya decal and a blue pressure plate.