Sounds like the mufflers you want are the VTs. Quiet at low speed and loud when you smash the peddle. I bought a pair last fall and hope to put them on in the spring. I have a post on them on the PY site. Sorry I can't give a first hand account yet. I have Dynomax now and the drone is to much for me. They were a lot more quiet then the spin tech mufflers I had before them.