what can i do to improve my engine in my 98 jeep cherokee w/ a 4.0L inline 6?

ggroendyke09

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building up for Dunes.? I just purchased a 3" Rough Country Suspension Kit for my 1998 jeep cherokee and want to make it sweet for the dunes...i also wanted to know what i can do to improve my engine performance. everything on the jeep is stock except for the rims and tires are from a 2001. What should i do?
 
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