I want to get some RUMBLE for my 2010 Streetglide. It is factory 2 into 1. I have the Stage 1 kit and Screamin Eagle intake. I want a slip on that has a little sound to it. I eventually want to get Duals, but with all the other money I've been spending on it I just want to get a slip on for now. I know there's a ton of em out there but I have no idea how much difference there is in sound?