So I'm thinking about replacing the stock 6x9's, having already replaced the head unit with a Pioneer 4100UB. I'm no audio buff, but I've been reading all of your helpful posts and I just want to make sure I'm on the right track. I've read that it's better to overpower than underpower your speakers, but I'm not ready to dive into amps and subs just yet. My head unit is labeled as 14 RMS power output, and I've seen several 6x9 speakers that list an RMS range of 2-100, for instance. Am I safe to assume that I can just swap those speakers for my stock speakers and not have to invest in other components such as an amp?