nicho

Hello everybody, I was wanting some guidance and help with my current situation. I have a set of MB Quart QSC 164 Mid bass add on component set that is still with me from a couple years back. I haven't upgraded the system in my current car and was wondering if these speakers hooked up to an amp will do better then the stocks I have now? I would assume so, but I am worried because this set of speakers didn't include a tweeter with it and someone once told me that its more like a subwoofer. I nned to know what to do I've been thinking about getting a tweeter, but don't know what I will achive in the end as I'm really only after a component set and don't plan on an elaborate 3 way set up.

Anywyas please help me out and excuse my ignorance when it come to car audio.

Thanks