maf and throttle body diameter

[The Radium King]

sure. with your setup (or a 997) you need the immediate 90 off the throttle body, but benefit from an equal 90 turn into each intake manifold. with the oem setup you get a shallower approach to the throttle body, but a resultant 135 degree bend to one of the intake manifolds - more opporutnity for delamination, turbulent flow on the inside of the curve and reduced airflow.