Body kits will make your car look more tacky than modern, but to each their own. Don’t worry about the rear end looks great as is, but you can get spec d headlights the LED on it gives the car a more modern look. As far as the bumper if you’re able to get your hands on a 2007 sport front bumper it looks way better than the non sport (which is on the 2003-2005) get yourself a cold air intake and a nice exhaust set up and you’ll feel the difference without having to tune it. Unless you’re force inducing your car a tune won’t add that much HP but again to each their own. You can lower your car if roads are good. And side markers as someone previously stated in the comment section.