Originally posted by Penphoe
Dude - you need some sort of bracket in the 2nd airbox - without the filter, the airbox is not sealed, so it's basically like a huge vaccum leak. Not good.
You *could* try cutting out the filter material, but leaving a little piece in the middle to support the gasket.....
What he said, you have a vac leak if there isn't a gasket or other type of seal in the box .