Buy 4 used speakers (I prefer pioneers)
Buy a decent used deck (Again pioneer)
Rewire to the new speakers.
Done.....
Craigslist is friend.
Another vote for this. If you're up for the extra hassle, adding even a cheap 50x4 rms 4 channel amplifier will get you some more benefit. Again, Craigslist is your friend.
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1978 F250 2wd (460 c.i.d. / C6)- soon to give up the powerplant to an '80-'86 F150
White 2000 Grand Prix GT coupe One still slow and loud... other one scoots just a bit.