Hi Tinkertoy. I ran a Luftmeister 2-1 exhaust on my R65 when I had it cafe'd. Sure it was loauder than stock but anything would be louder. The stock exhaust is so quiet I would scare pedestrians when I rolled up to a corner off throttle.
I thought it had a nice note and wasn't obnoxious. Also the end cap is removeable and it can be repacked with as much or as little sound dampening material as you like.
I converted my R65 into a sidecar tug and the cafe parts are riding a shelf in the garage. Getting a little too old and stiff to be laying across the top of the tank now.

Let me know and they may find a new home.