The best intake modification is an aftermarket intake kit, whether it be AEM or Injen, cold air or short ram. A free modification that's about as effective as the short ram is just to remove the restrictive air inlet duct. The fan on the radiator blows air right into the intake, but I'm not sure that accomplishes anything.
Exhaust you will probably want headers, and then a free flowing muffler. But since you sound like you're on a budget, the headers might be out of the question.
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