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The only ones that have been noted (dyno proven) has been the Racing Beat REVI intake and duct. All the others have either been for no change or a loss. Just like the exhaust. Mazda squeezed as much as they could out of the Reni. So after market stuff doesn't really get huge gains compared with earlier rotaries. Generally this means you are changing for looks or sound more than anything else. Yes there are a few exceptions to this but this has been what has been found out over the past ten years of the Reni.
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