It had Suzuki's new Posi-Force automatic oil injection system (later called Suzuki CCI).[45][46][47] Production peaked at more than 5000 units per month.[48] In 2013, Suzuki renewed the Hustler motorcycle trademark for Europe, leading to rumors of a retro style 250 twin.[49][50] A 1967 T20 Super Six was included in the Las Vegas show of The Art of the Motorcycle exhibition.[51] T500 Titan (aka T500 Cobra, GT500) had a 500 cc air-cooled parallel-twin engine which overcame problems with durability, overheating and vibration.