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I think you need stage 2 to get to 400hp don't you?
It really depends on a lot of things. Are you talking 400 to the wheels or at the engine? Do you want 400 at peak power or 400 while cruising down the interstate? How is your truck running without the stage 1 or higher injectors? Do you have the compliment of other parts to get you to 400? How is the tuning on the truck, could it be tweaked?
There are so many variables that come into play when talking about boosting (pun intended) your HP up to a figure above 350 or so.
I think you need stage 2 to get to 400hp don't you?
One problem is that not everyone has the same definition of what constitutes "Stage 2" which can cause confusion. Some Stage 1.5's will get you close if not to 400 HP.
Sous brings up another valid point.
However, if you check out the link to the injectors that I posted you will see that in this instance they are in fact Stage 2 injectors by the definition that Tim the owner of Performance Injection Systems uses. He is a straight up no BS, six o'clock kind of guy.