MODEL FACTORY HIRO Publication: Racing Pictorial Series by HIRO No.23 : McLaren MP4/6, MP4/6B 1991-92MODEL FACTORY HIRO Publication: Racing Pictorial Series by HIRO No. 23 : McLaren MP4 6, MP4 6B 1991 92 The No. 23 of "MODEL FACTORY HIRO Publication by HIRO No. 23" is a great pictorial review of the McLaren MP4 6 driven by Senna and Berger which upgraded the engine from V10 to the new design V12 in 1991, the third year that turbo engines had been banned. Although Senna and MP4 6 won the first 4 champions of the season, the Renault FW14 from Williams,