what aftermarket parts would first go into your car?
1. Replace all the fluids. (Oil, Brake,Tranny, Diff, Coolent)
2. Tires - if needed, best performance upgrade you can make.
3. Radar detector.
4. Tint - Keeps the interior nice, looks good.
5. Intake.
6. Strut Tower Braces - Cheap and easy to install yourself.
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The list goes on and on, but that’s a good start. Make sure you spend the money on the general maintenance before you spend it on aftermarket stuff.