To Tanabe Racing Medallion Owners

Hello! I just installed my Tanabe RM this morning and the Installer asked me if I had a tip for the muffler. I told him there isnt one and so he warned me that because the end of the muffler is the same as the bumber I should expect to see the bumber discolored because of the fumes of the exhaust.

Does anyone have this problem or will it actually happen? Any experiences would be great!