Okay well replacing just the from COMPONENT speakers "a lot of people are calling it 4 speakers" That would work fine you are not going to get the best you can out of them as the factory amp in the head unit is not that strong. Yes even if you upgraded your deck and not the speakers you would hear a big improvement. Factory systems are not meant for any quality just to be there and have music. Also you will have to cut out the tweeter in itself not cutting anything to the dash just take it out and cut the speakers woofer right out of its metal casing than put your new one in pretty simple.
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