I tried the standard baffle, the quiet baffle, and the super quiet baffle on my straightshots slip ons. The standard baffle was way way too loud. The quiet baffle was still too loud for the neighbors. The quiet baffle measured 95 db at warm idle. The super quiet baffle measured 91 db at warm idle. I recommend the super quiet baffle.
Ordering from Dennis Kirk was a breeze. The baffles were here in no time, they are made of quality sturdy material and they were cheaper than anywhere else I searched. They were also easy to install. I gave only two stars because they cut the power of my bike very significantly and one of the reasons for new pipes was to increase power. That said I will have no problem buying from Dennis Kirk in the future.