Now there is fx2, which has better games like yoshi's island and stunt race fx. And then there's the argonaut (I'd really love to play dirt racer on a snes, it doesn't run in zsnes, and slowly in snes9x.)
I'm hoping the rom chip (or copier) would pass along the data through the special chip, and just call upon the chip for certain calculations or whatever it does. Maybe I can rip apart a stunt race fx D: