For sale I've got a Blitz oil-free air filter. Can't remember the model number, but its got a 4" inlet (I think), but its also got a velocity stack adapter on it with a 3" inlet. The velocity stack is crucial to straighten out the air flow. I used it on my old custom intake setup on my K03 and it works AWESOME. Provided a very nice throaty sound. Unfortunately it won't fit in the tight space where my new intake will fit. This originally cost me around $80 plus shipping. I'm looking for $50.
Heres a pic of the filter with my old intake:
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