The GTO, 3000GT and Stealth were noted for their transverse 3-liter, 24-valve V6 engines (naturally aspirated or with twin-turbochargers), active aerodynamics (automatically adjusting front and rear spoilers), four-wheel-steering, full-time all-wheel-drive and adaptive suspension. [2] Mitsubishi also marketed a retractable hardtop variant, engineered and converted from coupé models in California by ASC[3] and marketed as the GTO Spyder or VR4 Spyder for MY 1995–1996.[4] – the first fully automated retractable hardtop since the 1959 Ford Skyliner.[5]