The Ferrari 643 was a Formula One car designed by Steve Nichols and Jean-Claude Migeot and was built by Scuderia Ferrari for use in the 1991 Formula One season. Built during May and introduced at the French Grand Prix it initially looked to have potential to run at the front. Alain Prost qualified on the front row and took the lead, and although he was eventually passed by Nigel Mansell in his Renault powered Williams FW14, a second place in the car's first race looked promising. Aside from almost always being on the front part of the grid, it was not to be however. The chassis of the 643 was a total redesign over the 642 which suffered inconsistent handling issues, and was designed to allow for a more softer suspension travel, as per Prost's request. The car also featured Ferrari's first 'raised nose' design which allowed better airflow underneath the car. The V12 engine was upgraded six major times during 1991, with the final evolution used from Portugal to the end of the season.