I have broke in 4 speed engines, 3 GRP's and a buddys Nova with the ofna truggy box and a 4s lipo. Its simply the best box there is. When one of my buddys starter box takes a dump at the track they come to me and use my box. My box is setup for Losi buggy and truggy and it even started a Mp9 last weekend. Dont mess around this is the only starter box that should be sold in off road nitro.