After some dilemma between turbo and NA, i've decided to stay away from turbo as i have a shallow pocket

now i need some advice on increasing power for NA.
Currently i have installed:
a pod filter with stock intake box. ($120)
CAI. ($30)
new iridium plug. ($96)
EBC green stuff + RDA slotted brake rotors + bendix general rear pads ( $410)
Plans for future :
(1) 3-1 race design extractor with flexi pipe. (RPW) $486
(2) 65mm TB + manifold upgrade (RPW) $545
(3) high flow cat $?
(4) E-manage or unichip $250~$300 + install & tune $?
(5) bushes replace $?
(6)sway bar. ~$350?
I ranked them in order. what you guys reckon?
how much would a high flow cat cost? any specific brand or specification i shld look out for?
Any more things i shld add into my list?
Cheers
