If memory serves me right then the Flux is the brushless version and if you want speed then a 3s lipo is what you need along with a very long road. Should get you into the region of 60mph which is very very rapid.
If you are still running 6 cell Nimh then it might be a good idea to try 2s lipo first.
If you are new to lipo then spend a good few days reading up first.
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