do you have any other cars that you would like to tune. Like as in one without a 3800. If so I would go with the HPT because it can tune way more cars. The PT can only tune 3800 powered cars but costs quite a bit less.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)