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Discussion Starter · #1 ·
I just picked my KFX450 up a few days ago and was looking at putting a slip on exhaust and probably a aftermarket K&N air filter on it but heard something about the EFI would need to be reprogrammed if i do so. So my question is, do i really need to buy an EFI programmer if im just going to put a slip on and an aftermarket air filter?
 

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My first purchase was a slip on and pciii....I knew i'd be upgrading to a full exhaust sooner or later and additionally, I wanted to run a UNI filter with the S/O and that really requires some adjustments to the PCiii.
 
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