So I have a 17 gt base 6 speaker car and have blown a door speaker and am wanting to upgrade all speakers and add a powered sub or sub & amp combo in the trunk. These cars just have shitty sound system and I'm not an audio professional. I do race my car at the track in true street events so I dont want to add a bunch of weight with multiple subs. Just upgrade the 2 door and 2 rear deck speakers and add a sub for bass. So any suggestions will be greatly appreciated along with advice and do's and don'ts. Any speaker/amp suggestions appreciated as well.