Holley regulators
 

I'm adding a second stage of nitrous to my motor and have come up to the point where I need a second fuel pressure regulator. I have a standard holley fuel regulator that I can use and I see many guys using them. I always thought that there were problems with them. Is this true? Should I have a concern about them? It will be running off of a mallory 250 pump that is just for the nitrous only, and it is going thru a mallory 3 port return regulator. I currently run my pressure up at 12 psi for the first stage because thats how it was set up, but I need to bump the pressure down to 6-7 psi for the second stage. Thats why I'm lookig at the holley regulator. Any thoughts?

Also is there any modifications I need to do to the holley reg. in order to run it?