Well, I've refrained from posting about this, somewhat out of respect for the fact that FMF sponsors this site, but I'm afraid I've found myself recently disappointed by their fit as well.
I've used numerous FMF pipes. Most have fit ok enough with some minor tweaking to the mounts or bends. However, my most recent experience was very irritating.
I have a 98 KX 250. I bought a fatty for it and attempted in vain to install it this spring. No matter what I tried, I couldn't get the pipe to fit. While the bends looked ok, both mounts were materially off. I eventually returned the pipe to the retailer that I bought it from.
Having heard from a lot of other people that were encountering similar issues with the fit of FMF pipes, I decided to follow up with FMF. I emailed their customer service and support explaining the issue.
They essentially blew me off, citing that they seldom have fit issues and most issues center around their customers lack of expertise in mounting pipes. They also stated that all of their pipes should line up without having to adapt, bend, or otherwise move the mounts or correct the bends in the pipe itself.
They also suggested that I should have contacted them directly with any questions I had regarding fitting the pipe and questioned my ability to mount their pipe, even questioning whether I was clever enough to realize that the "floating" mounts had to be loosened and repositioned from their stock settings to line up with the FMF pipe. Having installed numerous pipes, I didn't feel it necessary to contact FMF to have them provide advice on how to fit a pipe that should have bolted right up with no major discrepancies. Perhaps I should have contacted them. In any case, I chose to return the pipe to the distributor. The distributor agreed to tag the pipe with a description of the problem and return it to FMF for their review.
FMF told me in our correspondence that they would inspect the pipe upon receipt. I had expected that they would inform me as to their findings, but I received no follow-up from them.
Oh well...I had been a long-time fan of FMF and I still think they make a better product than PC, but I'm not sure if I'll buy another FMF. It really seems that we're hearing far too much about fit issues recently. Perhaps, this is just my perception?