Why are you thinking of running the RX8 rotors for?
The compression?
The bevel?

If you did get RX8 rotors and put them in yoru car,that doesnt mean you will be getting the same HP/TQ as the RX8.

If you want them for the bevel,and help with port timing,then you can do that with 13b n/a rotors.

You find an RX8 in a junk yard?
You will have a better chance finding Osama BinLaden