A Stage 1 chip/reflash will add approx. 50 hp and more torque/boost at lower rpm. Costs $500-$600. Assuming car has been maintained, should not be an issue.
I had my ECU reflashed at about 70k miles, going strong at 190k miles. I don't often wring it out, but like the extra kick. On the highway, you can leave it in 6th and have plenty of juice for passing.
Mind the timing belt intervals. If lucky, you might have had a recent timing belt, water pump, thermostat, tensioner service. If not, you're due.
Looks like you're in Phila, so AWE tuning is in Willow Grove, and they install the GIAC coding.