So are you looking for performance or looks? If you are going for performance, not much you can do except Intake
/Exhaust since its an auto. You said you don't have a lot of money and is saving so I take it you won't be looking for turbo or any major mods. If you want to be able to beat people at races then I suggest you get nitrous. Otherwise your best bet is to go show. Some nice rims, dropped, bodykit. Just make it look nice. Not much you can do an auto and its basically pointless to go major mods with an auto because its harder to put the power to the ground.