Drone is a noise that is created by the aftermarket cold air intake due to its construction and design and the way the air flows in it. The drone noise is from air resonating in the intake tube as it flows or is pulled in from the vacuum the motor creates. At some rpm intervals and to some people the drone is a very irritating noise=constant humming. This drone can be a real pain especially if you are on a long trip, trust me it gets real annoying.
I like others thought it was cool at first but after 6 months and some DTC codes, I removed mine and went back to the stock intake.
For the most part the noise occurs in the plastic style ones with the tappered tube design. It does occur in the metal tube ones also but not as often as the plastic ones.
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