With vastly more air flow than the HIF44 SU supplied in the Moss SUpercharger kit, the HSR 48 Mikuni was originally designed as an upgrade for Harley-Davidson motorcycles. It features a profiled needle, like and SU, and Tuneable jets, like a Weber, so tuning is much more straightforward. It also features an accelerator pump, which makes a huge difference with the blower. Unfortunately, the pump is too small for use on the MG engine, so I modify the fuel bowl to have a larger pump shot. The advantage is much for flow capacity to keep on going after the SU would run out of air. The drawback is that you need to drive it like a motorcycle. Stomping the pedal to the floor under load will kill the vacuum signal, so you must roll into the power as you need it. Slower pedal = going faster!