An aftermarket exhaust wouldn't make your bike run rich, it would lean it out. The advertised extra power only comes from AFTER adding more fuel to fix the AFR. Thats done through larger jets in the carb or a fuel programmer if efi.
is yours carbureted or efi? my brute is carbureted and it came with an hmf full exhaust when i bought it and from my findings the hmf header pipes are actually smaller in diameter than the factory header pipes which i would think could cause a rich condition so if yours has the same exhaust on it and if it happened to be jetted at the time of exhaust install the jet size could be in question?
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