1. Get rims, You don't have to be a rich kid to get nice rims. You can go to a junk yard, take rims form other cars with the same lug pattern and put it on your car.
2. Get a lip kit, If you don't have a lot o spend, just get the front. Andy's Auto Sport has some or check ebay.
3. Get an intake, If you have a 4 banger, buy an APC Universal intake system (American Auto Parts). It is perfect to make your car sounding like a beast without buying an whole exhaust system. These usually run for $50-70
4. If you live were cops do not car about tint? get 30% tint, this will look good, sun out of your eyes and save the interior from sun damage.
Honestly I would like a loader muffler for my car but installing it could be pretty expensive! (Flex pipe replace cost me $200 at a regular shop) Lucky for me, my dad is a good friend with the owner, and the shop sponsors me and get things done at dirt cheap