Never dull works great.

 

My tailpipes are not fed into the tips and my passenger right tip still got a little golden on me. Borla cleaner removed it with some dedicated time and a couple cheap MF rags.

http://i695.photobucket.com/albums/vv311/DarrenWS6/04%20F150%202008/DSC02885.jpg

You can kinda tell in this picture, its the passenger side tip. That was from a few races.