This Custom Gaket Kit from LPC has been designed to work the same as the Yoshimura Kit Head Gasket at better price while maintaining OEM quality and realiability. The LPC gasket measures .018 in thickness and  includes an oil restrictor to maintain oil pressure in the motor while increasing compression in the combustion chamber. The LPC 2-Layer Gasket is a great way to increase power with OEM releability and precision at a reduced price.