QUOTE (nkeen07 @ Jun 22 2009, 08:57 PM)
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Just taking the airbox lid off...by itself...won't require a PCIII. The stock map is so rich that stock fuel setting won't hinder performance or compromise anything. Even doing a slip on pipe may not require a programmer...while it is recommended. When you really run into needed to tune is when you perform intake modifications. The stock intake tube is so restrictive that when you take the airbox lid off it doesn't really allow much more air to get through.
That's why I said it would depend on how rich the stock fuel map is...
I have had a good feeling that it might not need a programmer as bad as people think.
Much like old ones don't always need re-jetting for every little change... particularly exhaust.
Most exhausts on 4 strokes are not enough of a performance gain to lean out one that's a tad rich from the factory.
Most of them are more about sound than actual performance.
As for th intake changes... that usually causes a change to have to be made. However, I will have to agree with you that the KFX intake is VERY restrictive. It's gasping for air flow with the lid off and filter off. So it would surprise me if a lid removal or filter change would make enough difference to matter in performance, or need for a fuel controller.
Mine's staying stock... I just don't buy into all that.
If and when I make changes, it will be in a year after the warranty is over... and then I will consider an intake and fuel controller 1st.