Agree with Diesel911, anti seize compound is an exhaust systems friend. Also note, there are many grades of metal called stainess, but only the 300 grades 304/316 is truly stainless non magnetic. All 400 series are ferrous and will rust. If in doubt check with a magnet, if it sticks...it will rust.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)