I've had a few exhausts on mine.
Akro end can, I found it too loud for day after day riding; noise pissed me off in the end so it is now taken off and sat in the garage (mates thought it sounded nice from behind and it may have been okay for occasional trail rides, but not day after day in my opinion)
Leo Vince (x4 I think) end can. From an unscientific riders test, I think this sits somewhere between the Akro and the OE. Not done an extensive tour with it on yet but early impressions are favourable (though I have currently taken it off)
OE - yes, they are v heavy (and v robust) but I like them. V quiet in stock form, and can also be decatted. This is what I run most of the time on road and trail. No booming headaches.
So, if you don't fancy reverting to OE, the Leo Vince may be a reasonable compromise between loudness, weight and robustness.