Taken from Koenig's website "The 4,698cc 60-valve V12 motor had to be stripped down to fit special Mahle pistons which lower the compression ratio from 11.3:1 to 8.1:1 and allow a maximum 0.72 bar of boost. This is the highest of the three stage boost control settings which starts with 600bhp, 80bhp over standard on 0.5 bar boost. Stage 2 and 3 provide 700bhp and 800bhp via a transmission tunnel mounted switch. "