Check out the "How-to" section. If you want to avoid having to rejet because of the increased air flow the snorkel will bring you just block off 1/2 the 1-1/2 pipe you will be using with either duct tape or some other sort of tape. Works pefectly fine until you do rejet or leave how it is. Also, if it runs like poo with 1/2 of it taped off just start adding or removing some of the tape until it runs right.
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