Ok, this is probably a question which has been dragged over hot-coals countless times over the net, but value the opinion of fellow those here.
I have always had a decent exhaust system or slip-on on any bike I've owned, and am a bit disappointed by Kawasaki's offering for the '08+ KLR650. I really miss the sound of an engine as it should be (not what the authorities intended), to be perfectly blunt. I've been weighing up many options, and for this purpose I have favouritism towards a Yoshimura slip-on pipe due to using their cans for a long time. However for similar dollars delivered, a BigGun full exhaust system is a viable option, as are a number of others.
I should mention that I am not after any significant, nor any genuine power-gains...this is not the bike to consider such matters, and riding technique will clearly make the bigger difference. I don't want decibel decimating, just for a big thumper to sound respectable.
I would like to hear any of your thoughts, opinions, installation issues, any improvements to the bikes performance, blah blah.