Was looking at installing the jardine 4" system becuase of the deal on wwcd2. Curious which muffler this system uses? Also anyone that is running this system does it have the dreaded drone that everyone is talking about? My truck is used as a daily driver with 85 mile commute to work. I dont want to listen to a terrible drone in the cab for two hours each day. Just curious on the overall performance of this system or recommendations of another system you like. My truck has 126,000 and I feel the cat has outlived its useful life. Need help on a 4" choice. Thanks!