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That is an interface that allows the addition of an amp. An owner before you had a rocking stereo in there I can bet. Yes you can remove it. It is not really needed unless you plan on installing amps in your truck. But with most new car radios they have preamp outputs (the aftermarket ones anyways)so that piece is useless.
Damn, I thought I knew what it was. Guess Flux Capacitor isn't right.