I tuned my AT a few weeks ago and netted an avg of +10HP and +9tq(peak gains were higher across the powerband). The throttle is more responsive and my power delivery is very even, and I'm no longer fuel starved at low RPM. I even notice an increase in gas mileage, like I used to get around 410-420 with some spirited driving I now notice about 450.
There are a lot of deciding factors on how a tune will affect your car, type of mods being one of them.
Your car was dyno tuned, right? What were the before and after numbers?
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Injen Dual CAI | Illuminated Kick plates | Stillen Sway bar kit | F.I TDX w/ 12" Resonators | F.I HFC's | UpRev Tune | 300HP/225tq Mustang Dyno
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