Yea i've seen the exbox. Looks kind of cool. But pretty expensive. Its actually not that loud..
They did a great job with the sound supression.. which is why the price.
Cant seem to find Road Racing that arent specialty made anywhere.
I've read elsehwere the exbox doesn't perform as well as other setups, but I have no first hand knowledge.
yeah, i'm in the same boat with a 620. Fun parts for them are becoming more challenging to find. Road Racing has been out of business for a while, far as I know, but the exhausts pop up used once in a while.
If you want a mellow pipe and stick with the duals, I'm real happy with my Leo Vince Aluminum.