There is a black XR5 that runs at the Mt Cotton Hillclimb in the Tighe Cams series and that thing has got serious mumbo. The track is about 1k up hill and down and is quite steep. This thing does one continuous burnout from one end to the other...not the quickest way to run the track but very impressive. The only thing that is a worry though, is the last run he left his gearbox all over the hill, so I hope that doesn't mean the gearbox is going to be a weak link for the model...
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