I've had the Rush pipes on the since almost new, got the 2.5 baffles, they have sound but not crazy. This past spring I put the Torq Loops on, a little more sound no more drone.
Gas mileage is about the same as it was.
I put the Loops on because I never had a full helmet, always wore 1/2 helmet, over the summer months I bought a Modular helmet and didn't want the drone to interfere with my first experience of the Modular.