You shouldn't dyno your RX-8 until is is past the recommended break-in period, and even then you really shouldn't dyno it until you have 4000-6000 miles on the car. Also keep in mind different dynos, i.e. dyno jets, mustang dynos, roto dynos, will all yield significantly different numbers. If you dyno on a dynojet, I wouldn't expect 200, you will probably be more around 175-180 and getting closer to 190 the more miles you have on your car. You can try intec racing, http://www.intecracing.com,
they are 40$ for 2 runs +15$ for wideband hookup, they are based in Kent.