Originally posted by mcfast:
I think those big air filters are over kill.
What is the CFM of are motors? What is the CFM of those big K&N?
First off inverted cone filters rob power. And NO big filters are not overkill. Optimum size for a NA 2.5L is 600-650cfm Effective area. Get the biggest filter you can squeeze into the engine bay which is the K&N listed below. A less restrictive intake means less loss of natural cfm draw from the engine and therefore efficiency gain. The larger the filter the less restriction.
Could have made this for cheap.
K&N ru-3530 (~645cfm BTW!) ajusa.com $33.11, KKM maf adapter from e-bay $10+ shipping, rubbermaid breadbox heatshield $5. Guess you won't have the shiney intake pipe though. 
Newbie's might want to search before spending money on Kmart parts. 
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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