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I run a 9xl with a cf lower leg on a h@m skatter ( roughly the same size). You want to run 4s of at least 4600mah. With a x440 it runs 42-45mph with great run times and temps. With a worked y537/3 and the batt as far forward as possible it ran 52.8mph and still went 8 laps, temps were hot but exceptable. O-yeah forgot it was with a old cuda 125. Hope this helps, you'll love the ob tunnel.
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