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A buddy of mine's dad does metal sculpture, and he turned me on to a really good treatment to keep steel for rusting. He uses an actual store-bought product, but showed me that wiping a HOT exhaust (run the engine for 15 minutes or so) with some WD-40 or oil will cause the metal to turn black, and ultimately return to a "bare" metal appearance. This is best done on either an exhaust that is already rusted - after cleaning it up with sandpaper or Scotch-Brite pads, or on a bare metal exhaust. Obviously, be careful putting the stuff on the hot exhaust. When my zooper beetle, Barney, had it's valve cover sealing issues, oil dumped all over the single quiet pack muffler, and now it looks like new on one end, and rusted at the collector end, so I know it works with regular oil too. Jake Kooser