bigger engine (3.5L+ vs 3.0L), more room from the edge of the valves to the walls of the combustion chamber/piston walls creating higher flowing ports, unrelated to cross section area.
~Induetime~ "Lag Less" First Stock Turbo to break 500WHP on boost alone. New track car project "Diseaze": http://arizonazproject.wordpress DOT com Custom fabrication for the Z32: search QFAB on Facebook More custom fabrication: search FuturFabrication on Facebook