The Carbon Cub has seen a long list of modifications since it first entered the market. CubCrafters developed its own engine, the CC340, for the Carbon Cub. Today there are six models available: two versions each of the SS, FX and EX. The Carbon Cub SS is the production LSA model. As such, it has a gross weight limit of 1,320 pounds. The FX model is available through CubCrafters seven-day builder assist program and is delivered with an experimental E-AB airworthiness certificate, while the EX is a full kit option.