Quote:
Originally Posted by BMW DIY Guy
Very very well said and exactly my thoughts as well.. I mean with my single channel install, I initially had HORRIBLE vibration right at a certain RPM simply because of a single bolt clearance. Found it, fixed it, zero issues after.
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Yes, that's that other thing that can happen.
A harmonic resonance can occur at a specific RPM and can be engine/drive train related.
The system will vibrate more at a specific resonance and make contact with that needle in the haystack screw.
You did well to find and isolate that!
That's also why you see resonance dampers on some OE systems.
Usually just a weight(s) clamped onto the pipes.