Quote:
Originally Posted by bbboomer
The noise is somewhat like a rhythmic knocking noise but it is not a metallic, solid sounding noise.
It happens at low engine speed and seems to increase in frequency then disappear with higher engine speed.
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It's been a while since I had an SD but I seem to recall that once, in a front pipe replacement, the shop broke the first exhaust support which if my memory serves is around where the front pipe curves to run under the firewall.
Anyway, the noise that resulted was similar to what you are describing. Your support may be missing or damaged and the exhaust work you did is just amplifying the problem.