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Three years later, after a complete engine rebuild, considerable dyno time, and various tweaks and changes, the four-rotor, AWD RX-7 is fully operational but remains an ever-evolving project that ...

That's what makes this RX-7's power output so incredible. Using a four-rotor engine instead of the stock two-rotor gives this RX-7 a sound that's a cross between a superbike and an electric drill.