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I would say coilovers or springs depending on your budget. You will feel that a lot more than any other mods. The mild amount of power you gain from a tune, exhaust or intake are not super noticeable in the butt dyno.
Plus there is very little warranty hassle from springs or coils. With a tune you could run into large PITA if you have an engine issue. The exhaust not so much of warranty issue. Intakes can be taken off easily.
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