For NA power:
-Full exhaust
-LTH or Z1 short headers with DE test pipes
-Pullies
-Manifold but might hold off on that one for now
-Clutch/flywheel will free up some unsprung weight
Also look at making the car a little lighter to improve performance, also note that the farther you get into modding your car even NA you will need a solid tune also.
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