When designing the Airdog II-5G and the Raptor 4G we took into consideration the increasing power levels and reliability that are being sought out by diesel enthusiast. By adding our boost compensation kit, we can maintain steady full pressure on high horsepower builds with just a single pump. Our diaphragm regulated and demand flow design further advances higher horsepower goals and fuel system longevity! Add this kit to redirect boost air back into the fully adjustable diaphragm regulator to increase fuel pressure under extreme loads!