is it neccesary to tune to throw on a different turbo?

[pj91gsx]

This is not my car. This car has a 255 hp, a fuel lab afpr, a boost controller, and boost gauge.
My friends 14b is going bad so he want to upgrade to a 16g but my brother is telling me that he will need to tune to run the 16g or any different turbo. This car has stock injectors. What should my friend do?

 

[turboglenn]

Yes, any time you upgrade turbos, the new one will be pushing more air at the same boost levels making the car run leaner, so you will have to richen up all the areas under boost. The general drivability should still be fine though.

 

[pj91gsx]

So, what exactly would i need to do if my friend wanted to run the 16g? Would installing bigger injectors with a keydriver be fine?