Reply to "Eliminating engine sourced vibration - Recap"

I believe the aftermarket insulators are made from black polyurethane. They compress over time, due to heat from the exhaust, enough for the headers to contact the frame. Notice the difference in thickness vs. the OEM insulators on the right. Jack "Bosswrench" DeRyke has been advising people to avoid these aftermarket insulators for at least a couple of decades!   

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