Originally Posted By: Linctex
LOL, your issues wan't "acoustic drone", you are experiencing an unintentional mechanical harmonic.
Try the weights - they are cheap.
ANY amount of mass WILL affect the frequency that the harmonic occurs.
LOl whatever its called, its worse now that its cold out. That pipe and its catalyst was replaced by the dealer, and its been bad ever since. Should i try backing off on the manifold bolts and tightening back down again?