Air Filters
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I like K&N. I tried out the HKS Super Megaflow, but it didn't seem any better and the filter got dirty pretty fast. The K&N lasts for 10 years. 
If you are still running the air pump on your engine, note that the HKS Super Megaflow will hook right up to it, but a universal cone filter will not, and you must get another smaller (crankcase vent) filter for the air pump. Also, if you have a Series 4 RX-7, you will need an adapter (available from HKS, etc.) for a universal cone filter.
I don't have any experience with the Apexi filters.
http://www.knfilters.com/
http://www.hksusa.com/

If you are still running the air pump on your engine, note that the HKS Super Megaflow will hook right up to it, but a universal cone filter will not, and you must get another smaller (crankcase vent) filter for the air pump. Also, if you have a Series 4 RX-7, you will need an adapter (available from HKS, etc.) for a universal cone filter.
I don't have any experience with the Apexi filters.
http://www.knfilters.com/
http://www.hksusa.com/
Originally posted by amemiya
I switch between and K&N and a HKS at the dragstrip and picked up 2 tenths of a sec. after many passes on each. I think it was in the mass air senser. the HKS smooths the air
I switch between and K&N and a HKS at the dragstrip and picked up 2 tenths of a sec. after many passes on each. I think it was in the mass air senser. the HKS smooths the air
i'd go with the K&N and save a few bucks...or for just over $100 US you can get a nice Bonez or Apexi cone filter.
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