FMF had a first generation pipe that was better then this thing they sell now but compared to the lrd and above brand it doesnt even hold water. It was like the p.t. pipe.  I raced my brother on his bike and he had a trinity stave IV setup with the trinity pipe and silencer. My stock bike with a pipe and reeds and good jetting at the moses lake sand dunes when we would race would keep with him until we shifted to 4th gear and then he would start pulling me.  So either that pipe was ok or the trinity is just junk idk either way the fmf was more of a mid - midhigh pipe and would flatten out when you got probably 7000-8000 if i had to guess I never tacked it.  We both would beat banshees that had quite a few mods done to them although this was back in 1995 or 1996 so banshees have came a long way since then.   I think the pipe was just called fmf rev pipe or plain gold series back then  not fatty but i might be mistaken.  I know it doesnt rev like the new pipes out now but back then it did good and is sad that fmf changed a ok design to a crap one that overheats your quad.  Maybe Emler had more hands on back then.