K&N Cold Air Intake Kit: High Performance, Guaranteed to Increase Horsepower: 2013-2014 Ford Fusion, 2.5L L4, 69-3533TTK

Very easy to install, got it done in around an hour. Although this replaces some stock parts, NONE OF YOUR STOCK FACTORY PARTS NEED TO BE CUT OR MODIFIED. This means that if you ever have to take out the CAI, all your stock parts will be in perfect condition and can go right back in. PERFORMANCE: Definitely feel the power at the front wheels in first and second gear (6-speed Automatic with Select Shift). After the first two gears you don't feel the power gain as much, but is still noticeable. Have yet to do my 0-60mph post-CAI but I will update when/if I do. Another positive about this CAI is that you only hear it when you really step on it. You don't hear it under light acceleration or when you are just cruising which is beneficial to me because I am running about 2,200RPM most of my commute to work. Like the other review here (also from Massachusetts), I see a decrease in MPG as of right now. I can usually get 30mpg under babying conditions and 25mpg stepping on it a lot and going hard on it. I have tried to baby it a little and I still can't get above 23.5mpg (according to the on-board computer). I will do my own manual calculations to confirm that I have a loss in MPG. Overall, I really like the CAI. Definitely feel the power increase on the stock 2.5 engine and it has a real throaty beefy sound under medium to hard acceleration. Worth the purchase if you are looking for more power and better sound. If you commute almost 100 miles a day like me....you may want to consider how much the loss in MPG will cost you in extra gas expenditure.