The first advantage is the reduction in the engines rotating weight, which the engine has to overcome every time you hit the gas. The reduction in rotating weight means your engine spools up faster, which translates directly into better acceleration. The second advantage is under driving, which means turning the engine accessories at slower so they don’t use more engine power then they really need. We adjust the amount of under drive for each application to maximize performance without hurting accessory efficiency. These advantages translate directly into significantly more usable HP/TQ and noticibly better fuel economy.