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Welcome to the wonderful world of rotary
ownership. Your best choice for more power, is going to a
free flow exhaust system, opinions vary on single or
dual exhaust. Second would be a low restriction air
cleaner. Third power tip would be an after market intake
and carb. As to the difference between 12A and 13B,
the 13B has a larger displacement, different intake
and exhaust configuration, and more horse power.
There is no part interchange between the two engines
unfortunately. A word on clubs, join several, I am currently a
member of 3 RX 7 clubs, and find that some are more
active than others. Good luck with the RX
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