Will this work a nitrous system dry? or is it just the Dominator that can do that

 

yes, All Holley HP/Dominator/Avenger systems do a nitrous system...
Wet
Dry
Wet Progressive
Dry Progressive

up to 4 stages plus a purge (assuming you have enough available outputs for it)
the HP has 4 outputs, which could be used to trigger a relay for Nitrous.


and it works Dam well with a Dry kit...
I ran a 500 Dry shot with no issues other than Traction.

 

Was that the HP

 

no... I use a Dominator...

the Avenger / HP / Dominator are the same software...only differences are total inputs and outputs..


and again...