As for the engine rattle, you might also want to check the serpentine belt tensioner and damper.

I just replaced mine since it would rattle at lower rpms, but with these things it's hard to tell at what rpm they will rattle. Timing chain will usually be quiet at higher rpms.

Other then that I'd shoot for the cat too.

xp

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1985 190E 2.3L - a constant project.