The GM system had a loud drone at highway speeds and didn't have any "rumble" to it. Also, the tips are not chrome, they looked exactly like the stock muffler with just another tip on it. My camera is out of batteries, but I'll get some pictures of it on Monday.
To answer everyone's question, I'm the Accessories Manager at a Hummer dealership where all of our salespeople have demo vehicles, so I have a big fleet of vehicles I can test stuff on.
So far, I've tried the SMA/Billy Boat Exhaust, GM Exhaust, Zoomers, and I have a Corsa on order. I've "eliminated" SMA and GM, and Corsa is going to have to blow me away from going with the Zoomer exhaust as our stock option.
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