These headers (for Hatori pipes only) have been quite the rage latley, and have been steadily moving off the shelves, and onto peoples 90 sized helis. Many have raved about more power, more consistent power, and over all, much better than stock. They are available for both OS91 and Ys91 motors, through GrandRC.Com.
I myself tried one around the time they had came onto grandrc’s website. I noticed quite a bit of difference, whether it was more power, or a broader range of power, something, it worked amazing. Running it on my YS91SR, it was a whole new beast. I let a friend fly it, who had flown my heli before, and he noticed the power increase as well. Needless to say he had one on his heli next weekend.
Here are some comparisons to the YS style header, with the Kasama on the Left and the Stock Hatori header on the right.
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