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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
A K&N will allow for more airflow, thus more HP, but does let some of the finer dirt particles through. Whether that matters to you or not, is for you to decide. I replaced my air filter with a Purolator air filter at 12K miles.