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Knows a couple things...
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No, where the TJ is concerned, the K&N air filter adds no power. None whatsoever. A K&N can add power to some vehicles that have restrictive air intake systems, like the HP Mustang 5.0L or Camaro Z-28, but not the TJ since the TJ's air intake system is completely non-restrictive.

Neither will it improve your mpg.

What will a K&N air filter increase? The amount of dirt and fine particulates/silica/etc. that make it past the air filter and into the engine where they will cause additional engine wear.

For a Jeep, especially one that sees dusty offroad conditions, avoid K&N air filters like the plague.
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