A cheap and quick mod would be to remove the silencers in the stock airbox. Of course, this would make the car louder on acceleration. You can either replace the stock air filter with a K&N air filter for a better airflow, otherwise, you can go with an open air system, such as K&N FIPK, Airaid, BTG, etc.
The next steps people do are exhausts and, once it becomes available (if not already), Stage 1 for your '05 GT.
Better performance tires should be next, since the increased HP will not help too much with the stock tires.
But before I carry on even further, I believe there's been a discussion like this before. I'll see if I can find it so I can post the link, otherwise, you may be able to find it or someone else will probably post the URL as well.
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<b>\'04 PT GT Graphite Metalic w/Autostick: </b> Stage1, BTG Strut Tower Brace, Eibach Anti-Sway Bars, Airaid CAI, Mopar 2.5\" Dual Cat-Back (D: 14.48@93 - A/S: 14.56@90) <i>...more mods at CarDomain or PTCruiserWorld</i>
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