The lower HP rating "at the wheel" is due to what is called "parasitic loss" from driving the powertrain. Manufacturers used to put a bare engine (no accessories) in and engine dyno to come up with their readings. Now they put a fully accesorized engine on the engine dyno to get the readings they publish. This does not account for the loss through the drivetrain though. The Wheel Horsepower dynos will do this. An auto will absorb more HP than a stick mainly because the torque converter has to sling large amounts of fluid to get things moving.
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 '03 Inferno Red GT, 5 speed, STAGE 1, Mopar BOV, Plastic Intake, Modified Upper and Lower Airbox, Custom Airbox-to-turbo pipe, Borla dual exhaust, Maddog Short Shifter, Drilled/Slotter Rotors, Ceramic Pads, chrome wheels, chrome door spears, AMP chrome fuel door, PT Cruiser 3rd light diffuser, H&R Springs, Rear Sway Bar added, MGW chrome door lock pulls, Blane's hood struts, Custom license plate mount, some interior dress up stuff...more to come
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