Quote:
Originally Posted by Billy Mild
Dynomax VT mufflers do that.
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What the VTs don't do is allow you to turn them on or off. A significant part of the drone is attributable to an AFR that's too fat or rich. And it really gets going when you're in the 55kPa+ region of the fueling(VE) table. The exhaust gets "blubbery". Leaning it out tightens the note. Ever notice how the drone goes away on trailing throttle and a slight decline? But climb the incline with a slight acceleration and it gets obnoxious particularly around 1300-1600rpm.