Orion xtr 2500.1d vs 2018 xtr 2500.1dz whats the difference?

[akuma4u]

Hey im looking to grab an orion xtr 2500 amp but notice there are 2 models. One is a xtr 2500.1d and a new 2018 xtr 2500.1dz model has come out. So my question is what is the difference between the two? Has anyone dynoed the new dz 2500 model? 

Thanks

Edited July 5, 2018 by akuma4u