Ford Barra T4 Thermal Management - BlanketFord Barra T4 Thermal Management Blanket to suit our Ford Barra T4 Split Pulse Exhaust Manifold. This thermal blanket will help reduce under bonnet temps and help save sensors from being cooked over time. Installation Notes Once thermal blanket has been used, it will become rigid due to the glass fibers and are not designed to be removed and reinstalled multiple times. Thermal blankets are constructed with fire retardant material. However, if the