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I have had no issues with my stock speakers ( Sony name / Ford speakers ).  I did do the polyfil mod on the sub, with little noticeable difference in bass output.  My suggestion, if your not happy with the stock speakers or if in your case, they shit the bed, upgrade to something better.  There are plenty of options available for mid to high end speakers.  I am sure some members will chime in with specific recommendations but in the end, it all depends on your individual tastes and the depth of your pockets.  Good luck!