I need to know whats the best fuel injectors for my rx8 with a new Greddy Turbo kit. i need the secondary injectors i found 1600cc ones but idn if thats what i need?

 

You don't need any injectors, as long as you are keeping the GReddy kit as it ships.
It is only capable of 279 HP or so and that is within reach of the stock injectors.

 

im going to be pushing 10 psi

 

Not with the GReddy kit you're not.
At least not where the motor is at maximum Ve, where you need the fuel flow.

The GReddy turbo only pushes about 31 pounds of air a minute, so you only need 2.8 pounds of fuel for an 11:1 lambda target.
The factory fuel injectors can supply about 3.3 pounds a minute.

It will only maintain 7 PSI or so by the torque peak.