I've had no problems racing on any kind of dirt track with my 511. If your undertray is cut properly and you use velcro and the diff dust covers there should be no problem. It seal tighter than any 4wd I've ever driven.
I did have a weight come lose and get lodged in the rear diff housing but that was my fault. In short....best 4wd buggy ever..... Having said that I would like to see a tub chassis option just becaus I don't like undertrays.
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