The factory system is not terrible but truth is a $150-$200 upgrade made now will bring you years of much better sound. I have the premium system which is 8 speakers. If you only swap out the 2 door speakers you will be amazed at the difference. I decided to do all 4 of the 5x7s and expect it to be awesome. (when i get the time to do the 2 back ones)
Crazy man, just a few minutes ago at lunch I made the decision to do just that (replace just the front 2 speakers). Now the questyion is - upgrade just the speakers, or add an amp and add even better speakers.
Modifications Performance: Airaid CAI, 93P Tune by Torq, Dynomax Exhaust Interior: Auto Headlamp Switch, Leather Seat Upgrade, Infinity Speakers, Billet Chrome: Door Locks, Radio Display Trim, Door Lock/Unlock Covers, Map Light Button Covers, Air Vent Covers Exterior: Chrome Door Handles, Faux Gas Lid Delete; 3.7 Emblems, Stock Wheels Painted Gloss Black, Tinted Lights, Dark Gray Rocker and Hood Crease Stripes, Upper and Lower Billet Grille Overlays Engine Compartment: Custom Strut Brace