If I can't find the dimensions, I'll look into sending the guy the stock tube when I get back from Iraq (although the part is $131.60 according to Ford Parts
). The idea is that we'll replace the stock Engine Air Box Hose with an aluminum tube similar to Jesse's. This will increase air flow by eliminating the silencers in the stock tube (although one remains in the throttle body). However, I cannot confirm that tube is a greater bottleneck than the stock housing or filter, so who knows, these effects may be negligible.
Nevertheless, I like this solution as a compromise between the vulnerability of a CAI to mud, dirt and dust and the benefits of increased air flow. The custom tube combined with the drop-in K&N air filter is my ideal solution. Assuming I can get the dimensions. Jesse, where are you?!