You want loud. You want D&D.

 

Somebody just posted this link for me. Not sure what bike it is, but at least its something to judge by.
http://www.sportrider.com/tech/146_0410_pipe_clips/

Hadn't clicked on the D&D til I read this link. It is pretty damn loud. But, most of them sound good.
Hard to tell after listening to them over an over.