The manager, from the company that did the installation, said that there is no "sill muffler"? Is a "sill muffler" an option that is presented to the home owner during the selling cycle or did they just forget to install it? "We always advise our clients to get the undercoating, rust proofing and a sill muffler but sadly, these are extra. Upon signing you decided against purchasing these options, with the free set of steak knives, in favor of our econo-vision model." I left my bs horn around here somewhere.