Yeah, it's possible, but with all the work to accomplish it, you could probably spend less with a simple "internal" purchase and a few extras.
A professional Computer Re-Map costs $500 - $800. A complete Exhaust with downpipe and headers will run you $1500, and cheap Nitrous systems run at $400 - and is not full-time power.
Instead of all that, I would suggest swapping out your Cams for performance Cams ($200), aftermarket ECU Chip ($250), Cold-Air Intake (($150), performance throttle body ($80), Mass-Air Sensor ($80), and free flowing Muffler ($70). And when I say muffler, I mean a true performance muffler, like Flowmaster or Magnaflow or Borla. Not the import "tin-can" sounding mufflers that let people know you're coming, but don't release real horsepower.
Peace!