OMG I LOVE the fx! I'm glad to see someone on here with one. Is it an fx16 gts?

Anyhow, aw11 cap points the wires upwards. the ones that point out are ae86, the ones that point away to the sides are fx/ae92.

You could get a stock tubular header from a 20v or even better yet slap a turbo on, run 6-7 psi and go go go! You can source 4age 235cc injectors from a 91-92 geo prizm gsi or a 90-91 corolla gts. They are high impedence so you'd have to bypass your injector resistors. It's all really easy. if you wanna stay the na route get some cheap cams from pdm, clean up all the castings on the head and run rally agressive timing. 4age are really easy to squeeze some extra power out of. It all depends on which way you'd wanna do it.

And btw 4age benefit greatly from a nice exhaust.

Good luck.