I did this on my 00 GSR. Just wanted to see what the difference was like if I ran it with the muffler disconnected from the rear piping that has the two bolts. Sounds ricey in the 2k-4k rpms, but anything below that or above that it sounds interesting. The tone gets very deep/loud when you let go of the throttle.

Now for the butt dyno, very nice gains in the low and mid range. High end was a mess, couldn't pull for crap in 5th gear. Also, will there be any negative effect if I run it like this for too long, besides attracting unwanted attention?

-Dan