Can I modify a 2012 Honda Civic LX ECON?

I recently bought a 2012 Honda Civic LX ECON as my first car. I'm really into JDM/Stanced Cars, but also in saving gas. I've owned the car for a good 6 months and in really thinking about customizing it to my likes. I'm thinking about dropping it low and adding a body kit to it. I also would love to add an exhaust and intake to it as well, but I'm not sure is the ECON feature would get in the way of my engine mods. Enough explaining the question I want answers to is…

CAN I TUNE MY ENGINE UP OR WILL THE ECON HOLD ME BACK FROM MODS EXCEPT FOR THE EXTERIORS MODS?

My opinion - those types of vehicles are designed to carry one to four people from one place to another; they are NOT made to be a "race car" like some of the people try to do to their vehicles + modifications can cause the ECU to not function correctly & in States where there are emissions laws/testing, any changes will cause the vehicle to fail the tests

Customization is definitely possible. The expense of the venture will depend on the mod. Cosmetic stuff like body kits shouldn't be an issue for the econ feature. As for intake and exhaust, it depends on what you're wanting to do. Putting a high-flow or cold air filter/intake on and an aftermarket muffler or cat-back shouldn't affect anything. It doesn't sound to me like you're trying to build an actual street racer just customization. You should be fine with what you described.