The Lancia Delta S4 was one of the most bad-ass cars that ever appeared in the history of rallying. It competed in the short lived Group B category of the World Rally Championship in 1985 and 1986. Despite its name and resemblance with Lancia’s hatch, the S4 shared nothing in terms of construction with the production front-engine Delta. The all-wheel drive S4 featured a mid-mounted 1.8-litre 4-cylinder engine that utilized a supercharger and a turbocharger producing 550 HP (unofficially, more than 600 HP).
Via: