Dakota21601

Well, the other day I was tinting the back window in my car and was pulling the back deck out. Realized that the speakers would be a cinch to replace. Is it worth it without adding an amp etc? What have you guys done? I have always been a fan of Kicker component stuff and if it's worth replacing with stock wiring I might do a little. Anyone replace the stock sub using the stock amplifier? I obviously have the amp system with the sub in the back. Just curious as to options.... Thanks!