These speaker swap threads kind of worried me a little bit, but I'm in the same boat. I just bought this car and have the Shaker 500 system. I've messed with the settings a little bit and I'm pretty happy with how it sounds.
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)
2011 Black V6 Premium, Saddle Leather, Pony Package, Airaid CAI, Borla Touring Axle-Back Exhaust, 2.73, Security Package, Automatic, 4 Rockford Fosgate Power 5 x 7 Speakers, Side Stripe Delete, Hawk ceramic pads, BAMA Hybrid tune, Nitto Motivo tires.