Quote:
Originally Posted by 86design
the guy was telling me that if you just put a K&N filter you get 25 more HP.. 
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And THAT guy, was blatantly lying to you. Don't believe everything people tell you. Look it up and confirm it.
A simple google search, and you will find that according to K&N:
K&N Power Gain Search by Vehicle
Find estimated power gains of vehicles with K&N intake kit installed.
2013 FORD Mustang 3.7L V6 F/I - All Automotive Air Intake 69-3529TP
Estimated HP: 11.79 HP @ 5900 RPM
And how they measure it.
"Estimated Horsepower Gains
K&N provides estimated SAE corrected horsepower gains that are based on actual dynamometer testing for a specific or similar vehicle. The actual horsepower increase a consumer will receive will vary depending on such things as vehicle condition, fuel, weather and other circumstances. It would be impractical to test every possible vehicle configuration or year in which a particular engine may be used; therefore, many of our estimates are based upon similar engine/vehicle/year dynamometer testing that we believe to be representational for the vehicle listed."