Listen if you are serious about performance and really want to build your car up, swap your AT out for an MT, and if you dont know how to drive one, learn. If you just want to drive around town pimping your car around all day, with the occasional stoplight to stoplight launch, stick with your AT.
Its an established fact that people who are serious about car performance drive stick, and thats for a reason. Not only will you not notice as much from your upgrades with an AT, but you will not have the same control over your car, and the more mods you do, the faster you will find yourself replacing worn out trannies..........