I bought a K&N cold air intake for my 2007 Ford Fusion SEl 2.3L I4. The chart provided by K&N for my car showed 6.09 hp and I really felt the difference. I check my mileage on each tank of gas and notice a slight increase of about 1mpg. I think anyone who says more is exaggerating. My only problem is that I have a professional job where I have to drive clients and business partners and the entrance is a bit noisy for my taste. It's much louder than stick. I understand that many people will like it, but as a professional I'm not a big fan. In general I'm happy with the purchase.
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