I originally thought that I could put in a zener diode with a fixed voltage of 0.75V onto the signal wire of the pressure diff sensor and then gut the DPF (I'd still need a muffler), but I suspect that would eventually put the computer into limp home mode because I think (but do not know) that the ECU expects to see that pressure difference increase over time and so the reference voltage would need to rise. If I'm right, then a simple zenor diode will not work and considering how inexpensive these eliminator boxes are may as well go that route. My concern is how to program them or trust their internal self-programming works good enough (see the PDF on my OP for those instructions).