FMF definitely stands for they’re
Love the pipe thank you guys for being the only ones to have anything in stock saved me was able to make it to the races!I purchased this header about one week ago and so far I am very impressed with the results I have seen. I have a yz250f and it produces very good bottom end power. If you are looking for a new header this fmf megabomb is the way to go. The only thing I had to purchase in addition to the header was the fmf exhaust spring kit which was not included with the header.
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