I have the 5.2, but I recently put on a AEM brute force, with a heat sheild and it added a noticable amount of power, and the sound is very addicting. I think as long as you get a nice one with a good heat sheild you will notice a big difference over just sticking a cone filter in there.
1996 Jeep Cherokee Sport. 3" lift/31" combo. Some lights. Flowmaster. 5 different horns. Full size spare. No rust. Daily driven. Will be...forever.