It's china yes but it is a bigger bore than the powercore you linked there for helping your bike breath and perform better then the smaller more restrictive one. The only crap part is really just the muffler, look into the gpx mufflers on dhz mate they are decent quality and are a copy off the procircuit cans. Like I said before the only one which you may actually benifit from is the fmf 4.1 as it steps up to a huge diameter which gives it a better top end ( supposedly ) and awesome deep tone. Have you taken out the spark arrestor and some baffle to make it louder? Or are you going for looks and sound?
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