I currently have a 2006 Dodge Ram 1500 Laramie with the infinity 7 speaker system. I've been looking into getting a powered sub-woofer for under the seat and upgrading the factory stereo. I went to an audio store and the employee there said it wouldn't be worth upgrading the stereo, without upgrading all the speakers. They also said not to put the powered sub under the seat and make sure if you do to rip up the carpet and make sure it is mounted to the metal underneath. Just wondering if a after-market stereo is worth it and if anyone has any experience with powered subs under the seat. Any opinions would be appreciated!