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Anyone have any experience w/ a K&N Hi Performance Replacement Air Filter on your WRX? Thinking of getting one, but the reviews are mixed.
 

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Anyone have any experience w/ a K&N Hi Performance Replacement Air Filter on your WRX? Thinking of getting one, but the reviews are mixed.
Save your cash. As a general guide line, anything that will help performance in these cars will need a tune to operate safely. If it lessens the restriction on the inlet track, you may run lean.. which is bad. I doubt an air filter would cause anything substantial, but I'd look towards a tune of some sort (open source / Cobb access port) if you are looking for any power gains.

Also, a commonly overlooked note, filters that offer less restriction may also offer less protection to your engine ;).
 
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