Just ran a few packs through mine earlier to run it in using an 8.5 brushless setup which seemed noisey at 1st but seems a bit quieter now.I,m still not sure on pinion size with the 8.5 but will play around with 18/19 teeth tomorrow and see what goes.
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Hobao H2 Pro
xbox/ps3/Wii U : budge1972 (add me) 
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