avigar

I currently have the Stingers, with quad tips, installed by the previous owner. I'm looking into changing to the Touring version to reduce interior sound and noise levels. I'm looking for input from owners who have them installed. I'm also interested if drone noise exist. If so, at what rpm level is it most noticeable? Also for anyone that have the Stingers installed, what have you done to your interior to help reduce the volume level? I love the low throaty sound the Stingers produce. It would also be nice to be able to hold a decent conversation during the ride.