The Gibson on Skeeter's H3 sounds great, don't know if it drones though. I would love to hear other reports back on Out Of Range's idea of soundproofing the rear door and if any sound deadening foil had to be added anywhere else to break up the vibrations causing the droning. The roof is an area I would look at adding the sound deadening foil to, it doesn't seem to be very rigid and I bet it vibrates causing a fair bit of noise.

 

I changed up my exhaust and indeed have drone. Here's what I did ....

1) Local Muffler Shop
2) They cut off the rear muffler and did straight pipes from the middle muffler back.
3) My middle muffler was replaced with a Magnaflow.

I have drone ... Not terrible, but enuff to look at replacing with a different system.

I'm most likely gonna buy this ...

2008 2010 Hummer H3 Alpha 5 3L Magnaflow Cat Back Exhaust Free Shipping 16832 | eBay

 

I had the Hitech cat back behind a catless header set up, it sounded good and no drone. Recently I removed the Hitech and replaced it with a Magnaflow resonator and muffler - much throatier and very little drone.