Quote:
Originally Posted by synolimit
Changing fuel trims can be affected by the filter element. If they all use K&N they should all be legal or illegal.
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... You don't know how it works in CA. Every design needs to get CARB approved. Doesn't have a god damn thing to do with the type or brand or design of filter. It's intake system as a whole. K&N is just popular because it's popular.