got some questions, pleae help!
The next issue about the intake, I would personally use the lid(I am). The lid as you have said directs the air. In conjunction with the lid I would either do the free ram air or get an after market ramair/coldair kit. This will help the effect of a lid directing cool air into your intake tract.
The squeaky sound could be your tensioner. I have read a few posts about needing to replace the stock one b/c of failure. Although at least one of those was by a forced induction engine(different pulley stresses)

