I own a 2008 Mitsubishi Eclipse GS auto transmisson, Any ideas for potential HP upgrades?

I have modded the car as much as i could so far. and i know there are many more options for a standard but i was never very good with stick shift.

so far the upgrades i have done are the following:

Magnaflow Cat-back system

Air Intake

Racing Rims

I have been told by many people that turbos and nitrous can give you great results however the state i live in has no body shops that can install the parts. "trust me i looked" if there is anything else people can think of i would appreciate any ideas