Buggies aren't really designed with high straightline speeds in mind - aerodynamics and the surface required for a high speed run kind of make them a bit pointless.
If I was trying to see how fast an RC car could go I'd be looking for a touring car of some description and a long length of smooth tarmac.
For a buggy the ability to make it around a rough track means that the top speed is academic.
Sorry!
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