Yeah, I remember at least the first year or two of production, the auto RX8 had noticeably less HP than the manual. I want to say something like 40-60 less (as ridiculous as that sounds). It'll still be fun in the twisties though.
Edit: yeah, I'm sure there's a more concise site to compare the two, but the Manual makes 238 hp while the automatic only makes 197 hp.
Manual: http://www.edmunds.com/mazda/rx-8/2004/features-specs.html?style=100222015
Auto: http://www.edmunds.com/mazda/rx-8/2004/features-specs.html?style=100220565
Again, this might have changed in more recent years, I just remember this from a Mazda driving event back in the day.





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