How can i boost my cars speed?

ive looked for performance parts for my car and i cant find any, i have a 99 Chrysler Cirrus LX 2.4L 16vavle MFI, she still has power as it is, with 89,400 clicks on it, i barely drive it, but i want some more horsepower, compared to my 2.5L Cirrus Makes my 2.4L a dinky buggy, Help any 1?
Update: or maybe i can put multiple spoilers on top of each other up to the sky get maximum horse
Update 2: i just want more low end toque rather high end torque
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