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The Mazdaspeed exhaust for the RX8 (catback at least) is minimal to no gain. The only catbacks that I've personally seen and driven that make any difference is Magnaflow, Borla or Racing beat. I'm sure the others might make a few, but I can't speak to it. Your best bet with exhaust is to get one that you like the tone, and be happy with that. Pulleys are again another mod that doesn't really yield anything big.
Truth be told, I'd do the exhaust for the sound and then for power, get rid of the factory coils and get an Access Port tuner. They are both invisible to any law enforcement unless they look REALLY hard and will net you the best power and response. Couple it with a drop in K&N or CAI and it'll be a fun little ride. The best NA power is in full exhaust and tuning...
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