All the manufacturers recommend them to cover their butts in case you burn down your engine. But, one thing I've seen over the years is all machines can benefit from a tuner. Even in stock form. The OEM has to meet federal standards for emissions on them just like cars and they have to run them very lean sometimes to make it under the wire. So in a lot of cases adding fuel will give gains, and a free flowing exhaust can make them worse. Most of Polaris' machines are pretty rich on the bottom end as is well known, but mid range up they are typically spot on or a tad lean for making the most power they can.
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