That's because they need 12 to try to keep up with 8. ...and their tinbox whine sounds weak compared to the macho rumble of the Chevy 8 (Corvette) or even the Ford 8 (Saleen). But I must admit, they all sound fabulous in their own way, including the sixes from Porsche. I just wish I could have heard the 917 12's, they really must have been something. Film and tape audio on TV and audio systems just couldn't do it justice.