In July 1983, Maserati launched the sporty Biturbo S, for the Italian market only. Power was increased by to at 6,500 rpm, courtesy of increased turbo boost and twin intercoolers which fed fresh air by two NACA ducts in the bonnet. The chassis was updated as well with lowered suspension and new, wider 6½Jx14" magnesium alloy wheels were fitted. The S was recognizable by its black mesh grille and the external trim (grille frame, headlight housings, window surround and Maserati badges on the C-pillar) finished in a dark bronze shade instead of chrome.