Here is a sound clip of muffler delete on a 535. Since I will be changing it again soon, I though I would put up a sound clip of cold start and a couple of revs. Sounds deep and throaty but just a little too much for me. The exhaust is custom of course with 2 extra resonators just before tips to cancel out some of the low speed drone.
http://youtu.be/y_p8hmyb39c