This comes up all the time, the drone. My answer is :"Who gives a flying squirrel." Don't want drone? Don't modify your car. Simple. Or just get new exhaust tips or something.
Whatever. I want better flow/less restriction but would like to have a conversation with my wife without yelling in the car under normal cruising. Check my thread on side branch resonators. It is possible. This HPF setup will not appeal to many bc of drone. I'd be willing to bet.