I read a comparison on a bunch of filters a while back. It basically showed that all the name brands, HKS, GReddy, Blitz, etc, flowed pretty close to the same. But for every little bit more one flowed than another, the size of "particles" allowed to enter the engine grew accordingly. The one that flowed a bit above all the others was the Blitz ss one, but it lets the engine ingest some pretty large crap. Just be aware. I would just go with whatever you like, or can get on the cheap.
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