if i add an amp to my stereo,will it sound better?

i have a new pioneer 50 x 4 cd player.6 inch mtx speakers in the front doors and 300 watt pioneer 6 by 9's in the rear.but for some reason if i try to really turn up the noise the system doesn't sound that good.so if i add an amp,lets say at least a 300 watt 1,will that help?or should i put in a higher watt amp?i want a really good sound with bass.i do have a 12 inch kicker sub woofer in the trunk run off an amp but inside the car it doesn't sound that well.whats your thoughts?
 
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