Follow up after nearly a month of use. Getting right at 1mpg better fuel mileage. The drone at speeds from 50-65 mph on long drives is a little much. At 70mph and above the wind noise over takes the exhaust drone. Things I would change, the location of the muffler, I would move it further forward away from the evap system. I would use a less straight through muffler to reduce drone. Now that RIPP has an exhaust coming out that seems to do that I can't wait to see reviews on their exhaust.