I can answer the question with a definant there is no performance gain with medical grade. The only difference I have seen is that in VERY large quantity's (IE : you make full 1/4 passes on large foggers or multistage systems and the motor is only running just before the burnout and is killed on the return road) The cylinder walls will actually get some rust on them below the lowest point of the rings on the stroke with nytrous+, that does not happen with medical grade. Remeber sulphur is caustic in small amounts (typical street usage) it never builds up enough to harm anything though.
I am not sure on small amounts but i think most people around here are paying 1.50 to 2.50 a lb for small amounts here.
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A good plan, violently executed now, is better than a perfect plan next week.
George S. Patton, General (1885-1945)
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