I believe they do two different things. the holtzman tempaflow decreases fuel as the temps get warmer. Dial a jets you start lean and they adjust richer. I think that is how they work and I'm sure if not I will hear about it soon. As for your question, the tempaflows work. Most say like a dream, not jetting required. He has a new one out that does the altitude adjusting and the temperature adjusting together. Sounds sweet to me.
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