Undertray is included. Proved to be very reliable aside from a diff gear stripping in my case. Very stable out of the box and if you follow some of the set up tips on here you'll find great tips for improvement.
Build was great, no parts needed forcing or changing to fit, be careful shimming the gearbox is the best advice I was given - and leave the rubber o ring out of the diff assembly or it will allow the diffs to loosen off.
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