The developers at Norris Designs have been working on twin-charging for some time. The basis of the setup you see here was originally developed in 2010, and they’ve been refining it ever since. It’s a bolt-on system with a bespoke Eaton supercharger which, unlike other twin-charging systems you might have seen, works in a true OEM style: that is to say, rather than running as a full compound at all times, it keeps the supercharger and the turbocharger separate. As is the nature of a blower, it spools up rapidly at lower revs, and as engine speeds increase the clutched mechanism de-couples the supercharger and lets the turbo take over. This essentially means that there’s no lag, just relentless thrust: huge torque throughout the rev range, and extremely usable power.…