First off, I doubt you would want to do this as Medical grade N20 is likely to be more expensive than auto grade. (Anything "military" or "medical" is always at least twice as expensive!)
Second of all, medical grade "NAWS" contains 20% oxygen premixed into it.(This is a safegaurd to ensure no one suffactes. N2O is similar to CO2 in that the body cannot metabolize it.) Since aftermarket nitrous kits are set to run pure nitrous, using medical grade would at least cause quite a few problems and at the worst... trash your engine.
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