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Yes they're worth it - but to make them get the HP you must open things up. Find a Jap parts house or website and get a cold air induction. This will get rid of your airbox. It will also give you more air hence more HP. Now you should open up the exhaust. Research that as well. Loud doesn't always mean fast.
Now your car breaths better - more HP.
Also K & N's look cool
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