Don,
I always thought about using pure o2 instead of NOS injected and wondered why O2 wasn't used. I would think it's because pure O2 in the presence of a hydrocarbon can ignite very easily. So I would think if you added the pure o2 to the intake charge you would probably blow the intake off of the car?
Not sure of this but seems like it could happen.
I work with pure O2 in gas form at 600 psi. We have to use cloth gloves and special cleaning fluid just to install gaskets in the piping. We have to clean all of the gaskets and flanges with teh fluid and then blacklight the fittings to insure there are no oils left. There have been instances of spontanous fires resulting just from body oils left on the gaskets from someone's fingers. I wouldn't want to be adding the stuff to my engine, just too reactive with about anything for me.
Don C