You can run NOS, Edlebrock, Zex or NX dry nitrous systems on an HO, or you could buy a nitrous system from another company or cobble your own together. They all have great results if you have a lot of fuel down low.
Nope. You wouldn't have to get rid of it to run Nitrous Express or Zex either.
However, nitrous and water/meth both result in cylinder pressure increases. I don't know what kind of timing your boxes are giving you, or how much boost your seeing, but when you start putting lots of fumigants into your engine headgaskets tend to start poppin'.
As long as you watch your pressures you'll be fine.
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