I installed the Iceman intake this week and noticed the same little difference that I had noticed with the same intake on the previous Focus. I had removed the Resonator and was thinking that it may be drawing in warmer air from the engine bay. I pulled the airbox and cut a 1/4" piece of lucite and then cut another piece in the same diameter as the resonator hole and attached them together with epoxy and a small screw. I then mounted it into the airbox with some black silicone adhesive to seal it from the engine air. It doesn't interfere with the filter or anything and it quieted it down a little more. No real power gain felt but I really didn't expect any.
Just a little bored.
Just a little bored.