What is the procedure for removal of the air inlet covers from the rear fenders of a 997.2 TT? I see that most other models just require a firm tug to get them out. However, for the 997.2, this seems to do no good. I was told that they are just held on by double sided tape. However, the parts diagram shows a clip(s), but feeling around inside, I cannot find one. I want to remove and insert a grill because my intercoolers keep getting clogged with trash from our lovely California roads. Thanks.