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Yep
 

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The idea is that an air filter that flows more air than what you have on it now will let more air into the engine. To keep the mixture correct which keeps the bike running efficiently in terms of power and temperature, you need to add more fuel to compensate.
 

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I've had a K&N for years on my raptor. never had it jetted and its fast(er). no pipe though. IMO, you can jet it, but you dont have to, but elevation is a factor also.
 
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