So just had mine installed and im experiencing massive drone in the rear of my car. the mid pipe hung low enough that it made contact with the middle brace so nu mechanic put spacers on the brace bolts. Then zip tied the middle and rear hanger. Nothing was touching, we made sure if that. Went for a test drive and experienced massive drone in the cabin. Went back and had the zip ties removed thinking that was the problem. Even tho it did lessen the drone a bit it's not completely gone. At midrange rpm the resonance vibrates the interior. Im not sure if the exhaust is touching some part of the car but i know before i left the shop it wasnt. Is anyone else with this exhaust experiencing some drone in car?