Well, your in the power adders section so choose your poison: Nitrous, supercharger, or turbocharger! Otherwise, check the 4.6 tech section for good info on bolt-ons and building your engine up NA.
Dont know what to do to make an automatic gt run faster?
Pressing the gas pedal in usually makes one go faster, but the same can be acomplished by finding a steep hill and going down it. Always driving with the wind at your back tends to speed you up as well.
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2006 Mustang GT in Torch Red
C&L Intake, Evolution Performance Tune, Borla Axle Backs, Hurst Shifter, 4.10's, JBA Long Tubes, Prothane Engine Mounts, Steeda UDPs, FRPP Charge Motion Delete Plates
Oh come on guys... someone give him up a nice recipe for a 4.6
I will start here. A CAI, Exhaust, and tune is good for every car as a good first step to more speed.
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2006 Mustang GT in Torch Red
C&L Intake, Evolution Performance Tune, Borla Axle Backs, Hurst Shifter, 4.10's, JBA Long Tubes, Prothane Engine Mounts, Steeda UDPs, FRPP Charge Motion Delete Plates
Dont know what to do to make an automatic gt run faster?
Are you asking how to specifically make an automatic faster?
If thats the case, get a higher stall converter and a new valvebody. (or shift kit if you want the cheaper way out.) A tuner or chip will also allow you to change the shift points. Other than that the same things that can be done to a stick car apply to the auto.
need more power for an automatic gt! 
