nope. don't get an fmf. even the most savvy engine builder can't make a pipe suck harder or rev higher than it does. a pipe needs to be built right in order for a builder to get it to perform. fmf's have no bottom end power, peak low and early, have no over-rev and come on real weak......
my f7 ran great, can't say anything for any other pipe, but i got a shearer in my frame waiting for my jug and head back from angus (he's doin some touch ups to fine tune the jug to the shearer for me) so i can slap her together and take her for a spin!