2002 SC1 3dr coupe....Audio System

Well, i just got this car like 1 week ago and i noticed how awesome the speakers sound and i would just like to know that the stock speakers are suppose to be for my car, because i dont want to rip it apart to find out. For example, i would like to know the wattage, and all the info on it, and also if possible, what the upgrade options where for the speakers when the are came out.

Thanks