The basics are intake, headers, and exhaust. It would benefit you more if it your car is a 5-speed manual.
Thinking of turbos and supercharges are pretty much out of reach on cost, and most of the time it just might be better to buy a GT.
Some other ways to have some more go, is reducing weight on the PT. Removing the rear seats and spare tires is a start.
Lightweight rims is another alternative, but this is a pricey alternative as they can go up to $2,000 for a good set of rims and tires. In addition, you might want to stay within the 16"s any higher your changing the unsprung weight and most likely will accelerate slower.
Another simple alternative is washing your car and waxing, carrying extra dirt and reducing drag co-efficient can somewhat dull your performance, but realistically, don't expect noticable performance changes. In addition, clean the interior, having a collection of gum wades, dirt, and other junk does weight down the PT.
I know there is alure to add body kits on the PT, but most of the time those things will just weigh down the car. Yes, I'm guilty of adding a body kit in my car, and I know it weighs more than my stock front facia and rear bumper! Stock fronts and rear bumpers are actually very light to start already. I'm almost inclined to say that the stock 03 and 04 front and rear facia are more ideal in reducing weight of the PT (there is no plastic piece on the bumper area found on the 01 and 02, and is integrated with the facia).
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