Nooooo... no pistons.
That what makes rx7 unique.
And as to your question of "does it worth it"...that is up to you if you to rebuild a rotary it'll cost you shy of $1,000 for everything you need and needing to replace other stuff and if you have TII I think it's worth it.
But, attempt to attain that much of hp from n/a would probably cost you a lot more than you want to spend.
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