If you want to move your model in dusty conditions you have to take care at the airfilter. Use the new Air Filter Cover to expand changing intervals. Just put over the filter element over your oiled airfilter and fix it with a wire strap.
Fits all 1:5 and 1:6 cars.
Dimensions: 115mm x 90mm (expands to double size)
Content: 2 Filter, 2 Wire straps
Source : Robitronic