How about this? I didn't look closely but it seemed decent. A search for 14310-41G10-H01 may find others. There used to always be a couple on ebay but they're now sixteen years old.
My first slip-on was by KR Tuned and I later changed to an R77. Both were slightly louder than OEM (no insert on either). But not by much. I've had a lingering impression that the KR Tuned gave better fuel mileage but have never taken the time to track that down for sure.
P.S. I've always wondered how that flat finish on the center body was obtained. Glass beading?
What pisses me off is I just saw one recently on my local classifieds, also for $100. I do love the Yoshi too (with baffle) but unless the bike is sporting seriously badass mods, I tend to gravitate towards all-OEM. Not to say I might not jump on an R77 if the opportunity arises.
I'm curious which part of the center body you're referring to? I recall everything as glossy.