Basic Bolt ons would be the easiest way to get a little more torque.
*4-2-1 headers vs 4-1 headers like BBP Headers
*Intake
*Exhaust system
The sure-fire way is turbocharge your car... but you'll be needing to upgrade the fuel system and you'll need to tune the ECU, along with needing to run oil feed and drain lines.
KA engines are torquey vs. NA SR engines from my experience
Instead of concentrating on power (if you are planning to autocross the car or take it to the track), concentrate on suspension, coilovers, adjustable arms, Wheels, and good tires.
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