Cobras are probably the loudest aftermarket. There use to be a problem with the Cobras discoloring a whole lot faster than any other exhaust system, even with playing with the air mix. Plus the fact that there were only the generic heat shields or try fitting the oem heat shields over them. I agree, the V&H's do have a deeper growl, though I have known a few that switched from them because the noise got to them after extended riding.
I have a set of Jardines for the project bike. I like the looks and hopefully one day can comment on the sound!
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)