I bought my 2008 128i used from a BMW dealer. It came with a BMW performance intake and exhaust. I just cleaned the trapazoidal oiled gauze intake. (which, by the way, requires taking the entire box out and disassembling it...) There was still a paper filter behind the gauze filter. Is that supposed to be there or should it have been removed when the new filter was installed?Though I bought it from BMW, I don't know who installed the intake. I found the installation instructions on line and depending on how you read them,I can see how it could be interpreted either way, but I think that it should not have been reused. Any thoughts?