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Holy mother of God, that has to be one wild kart to ride after they've outfitted it with direct chain drive to the rear axle from the 10,000 rpm turbo boosted rotary engine. All that power sitting just a few inches away from your bum has to make for a nerve-wracking experience, too. But we don't care if it's loud and ridiculous. With homebrew projects like this, that's part of the appeal.