So I saw this thread:    http://gstwins.com/gsboard/index.php?topic=64620.0
And I decided to attempt it. I got out my dremel and cut the inner pipe flush with the outer inner part. I can't really tell a difference in sound at idle but when I was riding it and opened up the throttle, I could notice a difference. It sounds like a aftermarket exhaust when the throttle is wide open. Another time I noticed it was when I was down shifting and the engine was slowing down the bike, it sounds pretty great. I'm happy with it. 

Hi. I'm very interested to hear how you cut the inside pipe. Did you use a 'hole-saw' (one that cuts a hole in a piece of metal) and come in straight from the exhaust end, or did you use a normal circular blade (and have to angle it it to chop off the inner extension)?
Presumably no rejetting needed, and she runs as smooth as ever?
Thanks for your help.

I just used a dremel circular metal cutting wheel. I didn't rejet it. I haven't noticed any change in performance.