Originally posted by APT:
Okay, we're all dumb.
The Speed Pride crew decided to not decide; it built both. The result has been dubbed Supra-7. An RX-7 with the lines and lightweight of the Mazda, but piston power in the form of a Supra 2JZ-GTE engine built for extreme power production.

I'm not dumb

As soon as I saw it I knew what it was.
Basically when running high pressure on there RX7 (25psi I think) they kept having to rebuild the rotary. So they put the supra engine in it for more reliability.