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Are you trying to decide between just those two?I have a '91 TRX 250X with a full system FMF(old style powerbomb header with powercore4 muffler).It's alot louder than stock but it gave good power gains.IIRC I picked it up for around $300.I don't have any experience between the two brands you listed...Whichever brand you go with;check about a rejet kit while you're at it

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