MK4 Focus ST turbo blanketPERFORMANCE Improve gas flow and increase performance with our Ford Focus ST 4 turbo blanket. Our Funk Motorsport Ford turbo jackets work to insulate the hot side of the turbo and retain the heat within the exhaust gases themselves. Hotter gases accelerate faster leading to them leaving the system sooner improving spool up and throttle response. Insulating the hot side of your turbo also helps to lower the amount of heat from the turbo that dissipates