Id list those mods in this priority from the bang for the buck POV
1. Reflash ( especially with good header )
2. Intake upgrade and heatshielding ( tb coolant bypass, thermal gaskets , injectors base coolant port cut ) work very noticeable when it more than +25 outside
3. Header ( not work well without reflash )
4. Good lightweight wheels (enkei pf01 , kosei k1, weds, bbs and so on ) to save 2-3 kg per each ( compared to stock)
5. Decat or HFC ( i hate farting of decat car )
6. crank pulley
7. intake mods.
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