Need help.
The car is R34-GTS-T, had done this mods when i got it:
HKS cat back systems
HKS air intake systems
HKS intercooler
HKS evc
I'm thinking to get the cpu change, like Apexi Power Fc, Greddy e-manage, or HKS F con S. But my friend told me it's better to get the fuel pressure regulator and fuel pump change.
1. A'm I make a good decision by upgrade the cpu?
2. What would be better for the next upgrade?
Thanks