7 DEI Titanium exhaust wrap was used to cover the exhaust from the header collector flange and down the exhaust tubes past the transmission. The Heat Shroud was used to cover the transmission fluid lines between the coolers and the tranny. After taking the truck on a spin, it was amazing how much wrapping the exhaust helped. The heat soak was greatly diminished and there was less slip in the transmission. This led to a faster truck, and even increased the fuel economy since there was less slip from overheating.