Its Lambda-1 technology is the heart and soul of the aura series. It was developed in-house by 2G and is based on the precise ratio of fuel and air theoretically required to completely burn the fuel (λ=1). This way, nitrogen oxide contents of below 50 mg/Nm³ can be reached – without being a lean-burn concept or having an SCR catalyst while reaching degrees of efficiency far beyond 90 percent. The absence of an exhaust gas treatment module also contributes to a reduction of the life cycle costs.