Just understand that you are replacing $15 speakers with what are probably $40 (wholesale) speakers. I replaced the front two speakers and was surprised to find the 2014 base speakers had a decent sized magnet, but are only about 25 watt per channel.
That part does not really matter as the head unit itself only puts out about half of that to the speaker. My point being you can upgrade and it will sound better (think mid bass and tweeter) but your not going to be blow away without replacing the entire head unit and install an amp with subs. just want you to manage expectations. I am a little disappointed at the slightly harsh tweeters in the four way pioneer speakers I put in. I did it solely on the price I was able to get them ($30).
It is such an easy mod, really just a nice way to spend a friday or saturday night drinking beer in the garage.