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Originally Posted by freekyFX4
What are Kwik filters?
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It is a diy low buck filter. It is a napa #6637 filter that can be adapted to the 7.3 motor. The 7.3 has a very crappy factory air box and this is a cheap way to get better air flow to clear the way for more power. When the 6 liter came out ford had donaldson build them a better air box that flows better and captures more dirt (up to 3 pounds). There are 6 liter guys that make a lot of power with the stock air box and an aftermarket one is considered to be a waste of money by some. I think the 6.4 uses the same box.
