Your stock 2002 was rated at the flywheel for either 250 or 275 HP depending on transmission. Figuring in a 20% drop for drivetrain loss would put you at 200 or 220 rear wheel horsepower respectively.
The horsepower gains advertised by a lot of tuning companies are figured at the rear wheels.
Torque doesn't really matter as long as you know that the peak will be between 2200 and 2600 RPM depending on how healthy your high pressure oil pump is.
You can do the math.
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