I've had my BTG cat/back duals for about three weeks now and have made a couple of long freeway trips with it. I'd read comments about the 3000rpm drone, and I suppose the sound is a bit more noticeable there (roughly 80mph with my auto tranny), but even I don't think it's that bad, and I really didn't want much of an increase in sound level in the first place. To me, up to about 70mph or so I can barely hear it, even with the stereo off.
Did you have the diffusers put into the tailpipes? I didn't, but I understand that it will quiet things down a bit.
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