not sure if this interests any of you? but I just installed an aFe Apollo GT muffler and am very impressed with the sound.
It has a nice aggressive sound at start up, then settles into a deep throaty tone that I love.
I don't hear it over my tires on the highway when cruising, but when I step on it, it sounds like a v8 with a nice rumble to it.
No drone what-so-ever. All for $193 on amazon and I installed in 20 minutes myself. I also clamped open the flapper(should have just removed it) and tape over the resonators.
here's a clip