I don't remember an RX-7 off from this board but that doesn't mean I missed it. Power2weight has a Miata that has the 2.3T in it. Myabe yopu are thinking about TF. I seem to remember a Mazda or two on there that had the conversion. You might check in their Proven Formulas thread.
Is it Springtime/Tornado Season in KC yet? I miss those little dust devils.