My car has a am/fm radio with tape, and concert sound speakers. I am looking to upgrade to something a little more potent without spending too much. Any Ideas will help. Thank you.

I just went to walmart and bought some sony xplod''s, they''re cheap and sound pretty good, you can also get a good stereo for under $100 there

This is very minor problem. you should repair it.
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In 2013 Regal Gs, it has a audio system with available GPS-enabled navigation Ask a mechanic if its possible to have that in your car ;)