I'm not really interested if my F800GS sounds louder or deeper or has a few more horsepower as a result of adding an after-market exhaust. The real reason I am interested is because of the only real complaint I have about the bike (which is superb in every other respect), and that is the amount of back-pressure when I let off the throttle. I thought it would be less pronounced after a few thousand miles, but I am still annoyed by the feeling that reminds me of the compression release I used have on an old 2-stroke motocross bike. It's very annoying at low speeds off road when I don't want to feather the clutch.
Does anyone else notice this? I figured if I opened up the air intake and the exhaust it would help, but that's just a theory. Any thoughts?