Airflow problems, need opinions...

[beetle1303]

A few adds to the previous.

1. Air flow under a bus is much less turbulent than the air flow above.
2. Along with the pipe you can imagine of an inlet manifold (port matching, flow bench stuff etc.

Also you can try this little experiment:
(trying to imitate a wind tunnel)
light a cigarrette and blow the smoke through a straw against some things a coke can or a...brick. lol. Try with different sizes and shaoes and you will see my point.

Chris