I don't understand why Benz and BMW are going down the SCR route. We simply don't have the infrastructure to support it. We do not have urea stations at the gas station like they do in Europe. When much larger diesels made by companies like MAN and Scania are able to use EGR for Euro 5 emissions, why can't BMW? I hope they're adopting the next-gen injector-systems that Audi/VW are using which are capable of much higher pressures.