The length of intake rails are important in creating intake velocity. As a rule, longer runners supply more low end power and short runners provide more high end power. Several newer cars such as the Taurus SHO Yamaha engines had duel intake runners with the long ones used below certain engine speeds and the short ones coming into play for higher speed. I'd guess the DeLorean PRV is a compromise. Bruce Benson > Why did PhD's at Peugeot et al find it necessary to use >intake rails > vs conventional shaped intake manifold? > Bill >Robertson > #5939