I agree with James. Stick to rotary in an RX.

Rotaries don't like heat. Turbos generate heat. They also are easy to increase boost for more power which also generates heat. How many stock turbo RX-7's (2nd or 3rd gen) have problems? Few. I only hear about problems when people (who don't do their research) start modifying them. The other issue is apex seals. They wear out over about 150k miles, +/-25k. Rebuilding a rotary is common because the engiens are failry old, and it is very easy/cheap to do compared to piston engines.

The NA 13B is one of the most reliable engine designs with much fewer moving parts compared to piston designed. Since the RX-7 hasn't been for sale in the States for at least 11 years, and the NA 13b since 1990, stories about rebuilds doesn't surprise me. Anyway, I have 158k miles on my 13B. It leaks a little oil, but the engien is pretty strong.