Well, that's a tough call... They're both relatively inexpensive, easy to tune and hold the tune very well. I really haven't decided yet which one I like better. My last OS lastet over 8 gallons, the novarossi is a first for me so I guess I'll see.
Nope. It might be worth to try. Is the os 2090 for the os speed?
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The 2090 is for the speed, but I hear some people are also using them on the XZ-B(blue head). I run 2060 for a .21 XZ-B speed and blue head and they are a really good. It has been a WHILE since I last tuned my Speed, same tune awesome mileage and power temps.