Device, system and method, in a vehicle communication system, of providing guidance, route and safety information to a driver. The mixing volute is configured to impart swirl in a first direction to charge air passing from the air inlet and into the volute. This asymmetry is accomplished not merely by reducing the signal processing power of one of the PHYs at the expense of the rate at which symbols can be communicated over the link, but by transferring the signal processing power from one of the PHYs to the other PHY so that the symbol rate can be substantially maintained as compared to the symbol rate of a symmetric PHY pair. The subsets comprise groups of data vectors, and the groups of data vectors have a size that is a function of a power of two.