I have a 93 civic si Hatch (d16z6) with 130 000 KM on it. I already have a cold air intake, header (4-2-1) and high flow cat. The rest of my catback is going to be installed soon. (i think i made a error buying a 2.5 inch piping but whatever)

I wanted to do some other mods but Im new to modifying a car and i wanted to know what would be better to do in the first place. Here were my choices (tell me other good mods if you can pls )

Camshaft, Camgears, valvesprings
Fuel rail, injectors.

Thx