I have the Leo slip on and run it in open mode. I had to remove my turn signals because it was long. After talking with the Leo rep I realized the shop sold me the dirt slip on. I exchanged it to the SM specific one and lost any gains I had. I of course switched back. So if you are planning on getting a Leo slip on, get the dirt specific one. The taper on the mid pipe is substantially bigger in diameter on the dirt specific one. It is of course louder but the difference is 15 miles per hour on the top end.