I just put on the Magnaflow today 5X8X18, and it sound good to me 80% of the time. The only time it bothers me is between 1600-2000 RPM'S I get drone, not bad, but enough to notice a difference when I'm on the phone. I was thinking of putting a resonator behind the muffler, but didn't no if this would cause restriction and lose the whole purpose of putting on a high flow muffler. What do you guys think, other than leave it alone or make it louder... I drive a lot and like the performance aspect, but don't like DRONE!!!