ya in a few weeks i was thinking about replacing 1 set of injectors with 720cc and i wanted to know would it be more to my benifet (in power) if i replaced the secondarys or the primarys thanks . ps what would be the power increase of the to and also whats the power increase between 720cc and 850cc

 

I don't think you understand how fuel injection works. Adding more fuel does not increase power. Unless you have a fuel computer you will actually lose power from overly-rich mixutes, plus your fuel consumption will suffer badly.

 

i know im buying a safc and i put a biger turbo on my car i was just woundering which would be better to replace.

 

Replace the secondaries. Don't do it until you have the S-AFC in and wired. Make sure you get it dyno-tuned.