oh gee, where should we start?[}

]
Depends what you are willing to do, how much you are willing to spend, and how much your warranty means to you.
Mopar Stage kits
Down pipes
Cat back exhaust
MBC (Boost Controller)
Pipes (hard)
IC sprayer, etc.
Do a quick search.
The easiest way to juice your ride and improve existing performance without modifying the look or sound of the car is get the Stage 1 upgrade. Second is pull the big white and the black silencers out of your airbox.
The Stage kit is 4 injectors and a reprogrammed PCM with more aggressive programming for improved performance. For 03's it bumps HP from 215 to about 235-240hp and a bump in torque also.
Anyone else?
If you get Stage 1, get it from tthrift.
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2003 GT Inferno Red,5-spd,Eibach Springs,Koni Sport Adjustables, Eibach front and rear Sway Bars, Mopar Stage 1,Mopar BOV,Custom 2.5\" Dual Tip Exhaust (Magnaflow),Hurst Short Throw Shifter, Pioneer DEH6500 Headunit, RF Punch 300 and 301 Amps,RF 12\" Sub and MB Quart Reference and Premium Speakers,Ronal RT 17x7.5\'s with Michelin Pilot Sport 225/45ZR17s, Koni Adjustible shocks, Keystone single scoop, GT Airraid Intake, Mopar Ground Effects
Homepage:
http://www.cardomain.com/id/ptgtredman
http://blueman.ptenthusiasts.net/index.html