Check this site, (
http://www.thermotec.com/ ) I use it on a number of applications. Wrapping your headers will cut down on under hood temps on conventional cars. Ours on the other hand will not because our exhaust exits down into the airflow under the car. Wrapping will keep the exhaust header hot, which will keep the exhaust hot, which will keep the exhaust velocity high and will increase cylinder scavenging.