[mekirk2]

Originally Posted by Red Devil's Rebel

+1

This.
"Modify" is to change something.

I've always believed that things like tint, wraps, spoilers, etc are thought of as "cosmetic mods"; and things like CAI's, tunes, catch cans, etc are considered "performance mods".
But actually - whether your purpose behind these changes is to increase power or just to make your car unique - all of these things are "modifications" or changes that you have made to your stock car.

...my 2 cents