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Hey just wandering whether or not it is worth, adding a K&N air filter to a 2007 GT Sedan, or not, I've heard that it already has a hiflow filter stock. But could I get some extra horsepower by adding a K&N
 

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Yeah, not worth it. Maybe in a year or two when you actually NEED to replace the air filter because it's super dirty, upgrade to a K&N. But the difference will not be noticeable so don't waste your money now.
 

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I installed one, and didn’t notice a difference.  I did feel a diff after I installed my CAI....much better sound too.
 

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I find it makes a bit of a difference. I like it for the pure fact you can just re-oil it and you're good to go.
 
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