wat are some upgrades you can do to a car that will make it slightly faster?

I am no expert but if your looking for speed you can do a number of things. A cold air intake is one way but it doesnt always make the car much faster (usually about 5-10hp not sure about torque). If your willing to void the warrenty you can slap a racing chip on ur ecu that will give you in or arround 20hp. An exaust system will help but often weigh more than the stock. For most inexpensive exausts, the gain in hp u get is negated with the extra weith you add on. Usually the upgrades will fall under these price ranges:

cold air cost: 100-300 bux
racing chip: 50ish bux
exaust: 100-2,000 bux

Keep in mind that whenever you mod you car federal law protects your warrenty and the only parts that are voided are the parts that the mod directly effects (i.e. turbo/supercharger voids tranny). Hope this helps.-Tristan