As long as you do not use "Ram Air", which is well defined in the GCR Glossary, you can take air from any place in the confines of the engine compartment, or any stock air intake location (if it goes thru the core support). Therefore, if the "shield" you are intending to use does not seal it off to an opening that was not originally used for the air intake, you are free to do as you wish from the throttle body/mass air forward. That would be from inside the confines of the engine compartment.
This was all gleaned from a protest on my car a few years ago, when the protester and the tech inspectors,applied the "street" definition of ram air, instead of the Glossary definition.
The Stewards of the Meet ruled us legal.
That said, I would offer the following: Be prepared to suffer for your close reading of the rules. There will be many opinions of the written word, and the final ruling does NOT exist within these forums, or even by the tech inspectors at the track.
Been there, and done that too. We all learn obout the safety issues, but too many performance issues remain in the Gray area nd have to be settled at a higher level. Not saying you should not...I'd do it again...just fair notice. I'm always trying to push the envelope...it's called racing at the edge.
Good racing.
Bill
[This message has been edited by bill f (edited June 13, 2005).]