03's dont have performance shift in them, 97-01 do, but if u have a shift knob and wiring harness...then it is do-able
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2003 GTP w/ Custom CAI, U-Bend and Resonator delete, custom 3" exhaust w/ Flowmaster 40's, ZZP 3.5" pulley, ZZP TB spacer and heat shield, NGK TR6's, and ZZP PCM