Hey guys. I've got an'06 sti. I just recently installed a catless turbo back and now I have a vicious rattle in or around the pilar between the driver door and back door. As far as I know it can't be heard from outside. It is the loudest at cruising speeds. I have pulled the molding off and even took the seat belt out and still can't find it. Any ideas? I'm willing to try anything! Thanks.