I've thought about it too.
You could use a 3800 Series II from a V6 Camaro, pop a GT35ish turbo on there, call HP Tuners and have a newer lighter very torque happy motor. You might end up with so many wire splices you'll be lucky to not burn up the car though

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'07 Mazda Rx8 Sport delivered 03/15/08 - it's B-Stock time!!
'06 Cool Z0K delivered 07/25/06 VIN 119811 -
deceased 02/29/2008
SSR GT2's SOLD to Randy at
DDM Works
Red Bull Drift Team 2008
Formerly Miles@Tirerack