second hand GTB's should be dirt cheap now.
5.5 in a 2wd is pretty fast. Modern speedo's can advance the timing of the motors, so you can get similar speed from a 6.5
The hobbywing speedos are pretty much the best value out there. The 60A will handle a 6.5 in 2wd, but if you really want to use the 5.5 then you may be better off with the 120A version
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