Whats the best aluminum/stainless full exhaust system for the wr 426? Nois is no cocern
if noise is no concern then look at pro circuit they say a 30% gain in power @102-3 db weight is around 5 lbs on the aluminum i just got done researching every known muffler for the wr450 and i went w/fmf powercore 4 @98 db our limit is 99 in nc
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