I'll tell you what I have done, and what warranties I think I voided. .
I installed a PE COMP, I HAD to

Pierce the injection pump wire, I also installed a Boost Elbow, when I did this, I new I probly voided the complete engine warrenty. Why?
The VP44 from "Dodge" on my truck makes 235HP, I now make about ~375HP from it, this is over design limits, and breakage won't be covered by Dodge, because *I* Broke it.
The Turbo, I put a boost elbow. The turbo is designed for ~20PSI, I am now pumping 35PSI of boost, over design limits, and I will be my own warrenty station here also.
I also installed new injectors,

hehe, well, once you do this, kiss engine warrenty goodbye,, Cummins didn't make 'em, doesn't use 'em, and don't sell 'em.
With Just my PE COMP, I figured I voided all warrenties between my Lift pump and my rear-end. (Lift Pump, Injection pump, ALL of the Cummins ISB, intercooler, intercooler hoses, exhaust manifold, turbo, clutch, transmission, driveshaft, U-Joints, Carrier bearing, Pinion seals/bearings, Ring&Pinion, LSD differential, etc. etc. etc. )
How else do you void that many items with just ~$700 ?
If you want to be stealthy with mods,, I think that Dodge/Cummins can ALWAYS Find out of clues of any mods, so if they really want to void warrenty, they can. If they want to be nice about it, they can do that too.
MerrickNJr
EDIT: The PE EZ, and other "Light" fueling boxes shouldn't be much of a problem with warrenty, if you get an onory dealer they'll give you the bird, but other places will be much more tolerant of light engine mods.
I trust the VP44, and Cummins enough that I feel safe pushing for the 500-600RWHP Range. (Gotta pay to play,, this may take a while

)