They both use the same engine, but the GT has an upgraded suspension over the V6, as well as tap-shift and a stainless (or chrome) exhaust tip (not sure which one it is), and probably a few other things
GTP has 3.9 pushrod engine different ratio than the base. Optional GTP embroidery leather seats, performance suspension, dual stainless exhaust, tap shift, 18 inch wheels standard, brake rotor upgrade than base. monsoon sound system stock.
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