Is a 4 piston brake conversion possible from 89' - 91 turbo / GXL to a base model '89 -'91 possible without any fabrication work etc? What's needed for the switch? I think the dia. of the rotors is larger in the 4 pot affair, so I'm assuming at least new rotors? Maybe I'm playing out in left fricken field though. Straighten me out here.

Thanks for your responses.