Originally Posted by willwren
Short, read the Techinfo article on airbox mods. Many people have had the same experience as you, and it'* caused by turbulent airflow. Your MAF can't get an accurate reading. The best way to run without a screen is a custom tube intake and cone filter.
Will'* right (Did I say that? - OMG what'* this world coming too?)
Anyways, I removed mine too, later I had to build a custom CAI using my stock air box to composate for it (MAF Screen) not being there. I can tell you one thing though, it sounds GREAT! A nice, deep & throutier sound when you punch it or when at idle!