Ayrton Senna's 1991 McLaren MP4/6, the V12, six-speed, championship-winning car in which he claimed his first home grand prix victory, is set to be auctioned The 1991 McLaren MP4/6, driven by Formula 1 legend Ayrton Senna to claim his first home race victory, is set for auction at RM Sotheby's, with an estimated price of $12million-$15million.