Originally Posted by
Minihaha
So - if you are buying an air filter that will flow at a rate in excess of 125cfm, you are essentially buying more than is necessary (it's likely they all flow higher than that, btw). This is where K&N 'gets' you - they say "ours has a higher CFM." OK, maybe it does, but if the car cannot achieve that higher CFM than it's pointless; a 'potential' CFM that is literally *impossible* for the car to achieve due to the physics of natural aspiration is of no value.
There's more benefit to a K&N than higher flow rate that we won't actually achieve. They're reusable, so I'm only paying $49 for a single air filter for the life of the car, saving money in the long run. With less restriction comes faster throttle response from the pressure differential leveling out faster. Those two reasons are enough for me to install one, even if it doesn't actually increase horsepower and torque.
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View my fuel log 2014 Mirage DE 1.2 manual: 49.2 mpg (US) ... 20.9 km/L ... 4.8 L/100 km ... 59.1 mpg (Imp)