[Jackpine]

Dave, as you see, I've moved your post to the Gryphon section and out of "Support". It's no biggie, but we try to keep the support threads specific to one problem and on topic.

"Drone" is an unpleasant sound that seems to be related to installing some aftermarket intakes on the engine. It's probably a resonant frequency that is hit at certain RPMs which is triggered by turbulence in the airstream. If you look at an OEM intake, you'll see those funny looking rectangular shapes along the sides of the intake, which are called "Helmholtz resonators". They were put there to dampen out the "drone" frequency by creating opposing pressure waves whenever drone starts to happen.

Bill can adjust a tune to get rid of an intake drone usually. (But, I can't help but think this may actually be a sub-optimal solution - this is my opinion only. I feel the aftermarket intake should have been designed so that it doesn't induce drone in the first place.)

Edit: I see Lars and I were posting at the same time. Glad I got the explanation right!

- Jack