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  1. FYI, my charges were cost of muffler + $108 for install. After the discovery of drone and pinpointing the RPM range I spent $80 for the j-pipe.
  2. I had the atak muffler put on with flap delete. Resonators are still on. I had quite a bit of drone when cruising at 1600-1700 rpm, which was all the time on the freeway. I just had a 30" j-pipe installed before the muffler and the drone is gone now. It sounds amazing!! Your experience may be different though. Also note that I have the 6.2. I also recommend keeping the stock muffler and flap just in case you decide to go back.
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