To answer your question - aftermarket cans, (ones with detachable baffles), are louder than standard ones. I've tried various cans over the last year or so, all with the baffles in place. Some were still too loud for me. Right now I'm running an Arrow can with the baffle in place and it's just right IMO. I also ran a legal Quill can which did not have a detachable baffle. That was quite quiet but gave a lovely roar when giving it a bit of stick.