[LS short box]

The reason I bring up the injectors is because on a different LS swap project I bought "rebuilt" injectors and then sent the ECM off for a mail order tune. Stock LS1 the only mod was headers.
When the tuner asked me about the injectors and he said the injector data was critical for a good tune. He said rebuilt injectors can be problematic flow wise. I switched out the rebuilt injectors for stock brand new. It ran perfect.