I installed a Quicksilver exhaust on my RRS 5.0/V8 dynamic this morning. My initial drive was like 'wow, perfect!' Nice growl when accelerating. Cabin noise was not even noticeable in that short drive. Then this afternoon I took it on the highway. Not so happy. It seems maybe between 1500-2000 RPM (? will have to look closer) there is a loud drone. When going downhill, or laying off the gas is not bad. A quick search found a few people with other vehicles who had installed x-pipe, or removed the resonator? Any advice or similar surgeries in this group?