Akrapovic, a Slovenian exhaust company, is showing off its work with a one-off motorcycle concept that exemplifies imagination run amok. Its Full Moon concept, making its debut at the Bad Salzuflen Custombike show in Germany, features a 1,524cc S&S Knucklehead V-twin nestled in a hand-formed, sheet metal shell. The carbon and aluminum front wheel that gives the bike its Full Moon name is a whopping 30 inches in diameter, and the massive rear end effectively makes up the exhaust. Additional details include ceramic brakes, fully automated steering and a hydraulic suspension so the bike can be parked upright.