To bring closure to this thread, I had the center muffler replaced today after my leak/loss of power returned some weeks ago. (I purchased an aftermarket steel muffler online and brought it to a shop for installation.)

I was surprised to learn that I had the original factory exhaust -- with the center/rear mufflers as one piece -- so cutting and welding was done.

Mercedes exhaust are made of strong stuff since the shop went through three blades making the cuts. The new center went in seamlessly and I actually like the smooth lines from cat to rear muffler, with no flanges.

When the old center came out, the pipes into it (where my fix was done) were loose and wobbling. Although the temporary fix protected the outside, rust and continued flexing still broke down the interior.

So, I once again have quiet exhaust and full power.

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black