I've got the non-Alpine system in mine, and I got the Mopar-Kicker upgrade speakers from moparonlineparts.com. They swap right out with the old speakers and the sound is night and day different. Especially the dash speakers, removes the 3.5" stock for nice tweeters that really bring out the high end sounds. The 6"x9" door speakers produce good bass for still being a factory 5.0 head unit. The only custom part to my setup is the 12" Kicker in the rear with an 850 Watt amp, and added a center dash speaker with "Alpine" dash cover, since it has the built in speaker hole.