OP, what are you doing with your car? Do you plan on doing any autox or track days? If so, then spend your money on EXPERIENCE. It will yield the most benefits.
After that, the first modification to the car should always be TIRES. Our cars have enough power to spin tires anywhere below 40mph. And the aero on our cars keeps them planted up to 160 at least.
Old rule of racing - other mods are worthless if you can't get power to the road. And, without good tires, you won't be able to do that.
I'd recommend Potenza Re-71R tires. About the best grip you can buy for the street. It's what most of the SCCA guys are running in the "street tire" classes.
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