Here's the problem with fmf. It's the owner.
Fmf are hands down the biggest pipe manufacturer. Cheapest too. So any one can get there hands on them. They wind up on 90%of bikes that are basic bolt on bikes. Next are toomey.
But they end up on these bike that basic beat up un maintained bike. So it gets sold to the next guy. Bike runs like crap, pipes get swapped along with 1000 other things. Now they turn around and say it was all the pipes.
It's like people saying banshees are high maintenance, hard to tune, temperamental to temp change, and all other stupid rumors. It takes one guy to say it and word to spread around. And being fmf has been around since the beginning that's the rep that they got. It's been being sai for the longest time.