Ok do i want a 7" or a 9" filter for basic mods. 3.4 intake exhaust pcm
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It would not hurt anything to have a 9'' but you would be fine with a 7''.
no dif really at that level, some will say the more filter surface area the better... but it really doesent make THAT big of a dif
i use a 9" fwiw.
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