Volvo developed an engine with both turbo and super charger for full range of rpm. Others resort to twin scroll / twin turbo. There must be big names R&D working on electric motor driven super chargers. MB and at least one other big name put in 48v system into car and MB eliminated belt all together in their new engine. This open up the possibility of having an electronic turbo charger or supercharger. Where are the aftermarket guys in this race ?