i dont know......my has the EGR delete and studs from ARP. I was driving one day ( it was real hot that day) and when i stopped...i noticed coolant coming out...now that its not hot anymore......it dosent seem to be losing or pushing coolant out. Now i have this deal when first thing in the morning...when i turn the heater on.....it takes a bit of driving before the heat comes through..temp is staying normal...sooo...i dont have a clue now..............soooooo I assume this test can still be done if your EGR is already deleted??? I would think that there would still be pressure i.e. bubbles coming out even if you had good head gaskets??? I want to do this and see what I get if for no other reason than to do it.