Do you know need to replace it?

I was thinking the same thing a few months ago after I noticed some rust on my cat. The thought of spending a few hundred bucks on something that is not "needed" rubs me the wrong way. Let us know what you decide to do. Thanks.

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1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
1970 280S, 263K - Sold - Beginning of addiction