Just a suggestion. Is it the drone or the NOISE? When I put the Torq Loopz and TBR's on last month, no drone and you can see right through the TBR's from front to back. It might be a solution to get some Torq Loopz and put them on with the Rush pipes. At least with the Loopz, any drone with aftermarket pipes would probably be gone for good and you can use the cats as paper weights in your study. You mentioned Harley in your post but I'm assuming that the Rush pipes are on the "B".
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