5. Audi Sport Quattro
Few cars embody Group B’s lunacy like the short-wheelbase Audi Sport Quattro S1. To meet homologation requirements, Audi produced roughly 200 Stradale (road-legal) examples in 1985-1986. Unlike the standard Quattro, the Sport Quattro featured a shortened wheelbase (about 8 inches shorter), widened fenders, and a 2.1 L five-cylinder turbocharged engine—roughly 360 hp in street trim but tuned to over 500 hp in rally form.
With all-wheel drive, adjustable suspension, and a luxurious leather interior (a nod to customers who actually drove these beasts daily), the S1 Stradale was both fast and deceptively civilized on tarmac. On gravel or snow, its racing cousin terrorized stages. As one of the most extreme homologation specials ever built, the S1 Stradale remains a reference point for turbocharged, four-wheel-drive ferocity.