Remember those kick-ass drivable Mario Karts unveiled at the L.A. Auto Show earlier this year? Did you know they started out as glorified golf carts.

Well, sort of.

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In this video, West Coast Customs founder Ryan Friedlinghaus explains how they turned those electronic GEM cars into monster, driveable, minutely-detailed Mario Karts. They started by essentially throwing out everything but the motor and battery and building everything from scratch.

The end result is spectacular.