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Anyone substitute only the factory air filter with K&N? What are your observations? Butt dyno or measured dyno? Inceased intake noise? Improved mpg etc.
 

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From what I've read on the internet, it looks like K&N air filters let too much debris into the motor. They've done tests with different types of air filters and found that some paper ones flow as well as a K&N, but filters much better.
 

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sjlee said:
From what I've read on the internet, it looks like K&N air filters let too much debris into the motor. They've done tests with different types of air filters and found that some paper ones flow as well as a K&N, but filters much better.
yup... I think apexi is da best for filter.
 

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More harm than good. If you don't have a replacement air intake system, the OEM air filter would do a better job. Drop in filters have little to no improvements at all.
 
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