Trace amounts of rust on muffler? Heck, I don't even live in an area with salt on the road or near the beach, but my muffler is just a sheet of rust already. Nothin you really need to do to stop it. I mean if you wanted you could clean it all down and paint it or undercoat it, but it's a little overkill. Springs do so much flexing, it doesn't stick well, and muffler gets so hot it would crack and peel...just a muffler. Anything on the underside is basically fair game for rust.

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'00 4x4 V6 XE
Yella 3pack