I am wondering about one disadvantage of upgrading to a cold air intake system. Cleaning the darn filter is a royal pain! Does anyone know how disruptive it is to routinely (twice/year) remove the front bumper? The filter is stuck behind the bumper and you cannot access it from under the hood. I should have stuck to the tride and true filter under the hood. If the 427s can take in radiator air, then my 4.4 should not have any complaints.
I'm going to rewire the intake and take measurements to see if there is a difference. If I don't see any, then everyone will have a way to save $300. The filter runs about 50 from K&N. Maybe even use a larger diameter.