1981 924 Turbo - How fast is the turbo?

[KillerBug]

I am thinking of moddifying the old K26 turbo off of my VEERRRYYY Dead 1981 924Turbo. (part #:931 123 004 07) I have seen people moddify turbochargers into superchargers. Since the exhaust side of this turbo ate a bunch of valve pieces, I want to do this & adapt it to my new car. I just need to know what size pullys to use...I need to know the maximum safe RPM for this unit. Also, if anyone knows of somewhere that sells a rebuild kit with roller bearings or something (for increased RPM) that would be great!

If all works out I'll post pictures of a supercharged spyder...