We've replaced RX8 clutches, the pedal is a little harder than normal, but not very hard, and it uses a very odd ceramic type plate. Replacing one of these requires extensive cleaning with denatured alcohol first, or it will burn out on first contact. I have one of them available with me, replacing it is a little pain if you dont have a proper lift and tranny jack. Need to disassemble the whole underbelly to extract the diff brace.
Aristocars has the proper tools and lift for such a job.