The Fitted Heat Insulating Turbo Cover by Thermo-Tec is the perfect solution to your turbo related heat issues! This new easy-fit design installs in minutes and can be removed just as easily. The Turbo Cover, in addition to reducing underhood heat issues, reduces turbo lag problems, and helps the turbo to spook faster. The dual layer construction increases performance and durability. Improve horsepower and performance by maintaining temperatures inside the turbo. Made in the USA. The part number for this item is 15004 and it fits T3 and T4 sized turbos.