There was a time when I was interested in getting a functional hood scoop, and I used to have a high-flow Green air filter in it, but that was as close as I ever came to making any modifications.
I live in western New York state, so I used to try to keep up with the rust, but it's a losing battle I've given up on. Rust Reformer only goes so far, I'm afraid.
Now I'm back to a paper air filter, and I've switched from Mobil-1 high mileage synthetic to the cheaper Walmart Supertech. I still love my car, but I've realized that passing inspection every year is more important to me than how it looks. It's got lots of scratches, dents, and spray paint on it, and the front of the hood is a little crumpled from a fender-bender my wife was in last year (the hood still opens and latches shut so I'm not worried about it).
Maybe if it was a bit newer and I had a little more change in my pocket, I'd do some stuff to it, but as it is now, I'm happy if it gets me from point A to point B.