DJ,

It's not just the length but the volume within the tube that helps. As the air is compressible you'd want the greatest volume to absorb the unsteady flow. What you want is a "stock" type air box with a long intake tube leading to the SIR at the end.

James [/b]
James,
I understand the reservoir principal and this was discussed. Althought you might benefit initially the amount of air the engine needs will give way to the restriction of the SIR. Problems like location & space complicate this, being a production vehicle.
While testing Chuck actuall felt the intake hose collapsing in his hand as the engine speed was increased. So use a good hose.
Dan