Buy Fram CA3915 Extra Guard Round Plastisol Air Filter

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This is the filter to use for a Jeep JK Wrangler inside air filter. It can be installed in the pre 2010 Jk Wranglers behind the glove compartment if you remove the plastic grate that is there. On a dusty road, the cabin air gets filtered. It is a factory mod on the 2011 and later models. Seems to help.

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I used this as part of a mod to have an in cabin filter in my JK. My only thoughts are that this will emit a smell for a week or two so you may want to look for an actual in cabin filter that is the same size if you are doing what I wanted to do. Perhaps that would eliminate the smell issue.