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I recently installed the yoshimura carbon fiber slip on, when decelerating from higher rpms, the exhaust makes a popping noise and fire shoots out of the exhaust. Would putting a k&n filter help smooth out(run leaner) this situation or is rejetting the only option?

Does anyone know the K&N air filter part# for the 03'636?
 

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K&N part number is KN-6003 for the air filter. It might help a little, but just understand that a LITTLE popping and even the occasional flame on heavy engine decel is fairly normal, and usually not any cause for concern. If it's outright backfiring like crazy and constant flaming, might be time to look at a Power Commander instead of an air filter, to get the air-fuel mix set up properly throughout the range.
 
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