We have an EZ on 1 or 2 stacked with a Smarty on 7 that puts out 414/840 to the wheels and is out of fuel (stock fuel system at the moment) The EZ is doing the boost fooling and adding a little pressure. Works pretty nicely. I am going to compare mine tomorrow when my Quad boost fooler shows up. Both of the trucks we are running are '03 SO's with Autos.