hey guy i have s4 no turbo extended street port or extreme street port engine in a s5 rx7 and also puting a megasquirt on the car .i also have i high presser fuel pump. And i was wondering if i should upgrade the secondary injectors because my power ban is from 4500 to 8500. but i dont realy no how much horse power it is creating i know it is around 210

 

Is an upgrade NEEDED where you are now...probably not. Should you upgrade if you go any further (IE: standalone) sure...550cc on the NA would be more then enough to tune 210hp w/in a decent range w/out stressing out the stock 460s... and it leaves room for NOS or something...

 

720cc would be too much on a SP nonturbo motor...

 

if you've got a standalone just get whatevers cheaper