yup. The EZ was introduced with a pressure increase only to get something to market quickly. Their new box (and the diesel dynamics equivalent) will be (in my opinion) a better choice for mild bombing, simply because it does not raise rail pressure. The new box can be "stacked" (put on in addition to) the EZ box to obtain timing, durration AND pressure modifications. That should have performance similar to the current bullydog box which does all three today (and sometimes sets codes from what I hear... )
basically you get performance gains by changing the combusion timing and by adding more fuel. additing fuel can be accomplished by increasing duration (time the injector stays open), or pressure (more fuel per unit time).