Since you're saying it's the evap canister, by drone do you mean like some type of dull rattling?
I have short tails and have had them for a while. Most of the rattles that were going to show up have. I've found that the only real harmonic rattles I get are the hatch itself, the plastic covering for the hatch, and the weight that is inside the hatch.
However, if you literally just mean drone from sound of exhaust, yeah that's pretty much a byproduct of having the short tails. Keep revs high and you won't hear the drone, just the VQ singing.
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