I just responded to a PM about this; but may as well answer here for everyone's benefit. Yes, those are 'universal fit' mufflers from JC Whitney. I am also using additional 'baffle inserts' ahead of the mufflers, and still they're a little too loud for my taste. On my blog at http://foothillryder.com/the-tiger-cub-project/ (bottom of the page) are three pics of what I've just installed, along with a quick audio/video clip of a cold start. As soon as I can I'll go capture a more complete sound byte. My first impressions (I did a nice little 35-mile loop yesterday) are that these mufflers are several dB quieter, and have a more mellow tone than the previous ones.