I haven’t seen any discussion in regard to this type of supercharger used on the RS4. I know that JHM uses a Vortech supercharger. The idea of getting the benefit of a roots style lower end without the high end torque fall off is very appealing especially in an AWD car. I’m not sure of the price difference vs. extra power would be worth it though. This forum is far more versed in this stuff than I am so I’d like to here if you have any thoughts. I’m all for incorporating new technology.
Link with some info:
http://www.dragzine.com/project-cars/procharger-variable-ratio-1-supercharger-project-5th-gen/