I'm looking at upgrading my injectors when I get the TO4E turbo and FMIC put up(as soon as I make up my mind, lol)...and I'm just curious as to how much boost the stock injectors should be able to feed fuel to? I think I'll go w/ 720cc secondaries and run about 15psi w/ the TO4E...that sound good, or do I need bigger? I'll also have the S-AFC by then.

 

With that setup you'll need at least 4 720's, but those would be maxed out or close to it. 550 primaries and 720 secondaries won't cut it with a big turbo at high boost. 550 primaries and 1600 secondaries is a popular setup.

 

What if I ran 2 additional 720 injectors? that would work right? I can do that cheaper then 1600cc injectors...