Do I need to upgrade my stock injectors even though I am going to use two extra 1200cc injectors in my intake track on the Greddy intake?

 

You did not give any info about your car, so it is hard to answer. Either way though, unless you are looking for extremely high HP numbers, the extra 1200s will give you enough fuel for 500RWHP or more. You will need a better fuel pump though, the stock one can barely keep up with the stock injectors.

Plus you will need a controller to control the injectors. Most people seem to go with the HKS AIC unit.

 

Besides the HKS AIC, there is also the Haltech F5 you can use which is cheaper, more accurate because you can adjust it from a laptop and it's easier to use, plus it doesn't show on the dash. Just my 2 cents.

 

Sorry, its a 3rd generation 13b rew stock engine for now until I get my turbo install, already have a TO4 but I will like to get a bigger one like a t-60. I do have a PFC with commander but I need a bigger fuel pump.