what's involved in putting a mp3 player in glove box for a fibre optic CD changer car.. Or is it even better to yank the whole OEM head unit and replace with a DVD player/cd changer unit? Any ideas on cost for that one?

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I am an enthusiast but you can't pry money outta my hands... Help me to get to full throttle on the Harmonic Balancer Crank Shaft Pulley RECALL!