Well I had to try it. I pulled the Siameese twins off the pipes and started looking them over. My conclusion was to poke out the salt and pepper plug in the middle of the openning. I did. They became a bit more authoritive. Not quite what I expected, but more for sure. Didn't seem to affect performance at all. Still, sent for a pair od 20" turn outs from JC Whitney. They are close to what Jardine has for slip ons for the Fury, and a lot less in price. I am going to Biketoberfest, so I need a bit more verbalization from the bike. I will let you know how the turn outs work.