Someone local enough is selling a tri oval Yoshi bolt on. Will it work for my gs500f guys.

I almost bought one of those for my bike a couple years ago (but I couldn't get the seller to commit).

Almost anything can be made to fit, with adapters and whatnot... I'm not sure it will just slip right on (but I certainly have seen them on GS500s before).

There is a lot of conflicting information out there in regards to rejetting... so my thought was, I would install it and ride it to personally see if any adjustments would hafta be made. When I previously swapped out my stock exhaust to a full stainless system, I didn't need to rejet, which was very nice.

Bolt on won't fit without a trip to the muffler shop. There is nothing to bolt onto.
Cue Buddha showing up to ramble on about making "da flanges" in 2005 but sorry don't make them no more.