flame arrestor

Hey all, recently acquired a Westcoast Flame Arrestor used, but I've never used it myself. The person I acquired it from claims that it was a fairly rare part, and I haven't really seen many of them myself after doing about an hour of research on the thing. I have it for sale right now, not...

I have recently purchased 97 and 98 XPs, and the 98 has issues with acceleration. From a dead stop it boggs bad when opened up. Even when it is plained out it won't rev above around 4500 rpm. The manual suggests flame arrestor cleaning. Has anyone experienced this, and may have some advice?