HKS R35 GT-R VR38 Metal Head Gasket23009 AN010 DESCRIPTION To improve the performance of R35 GT R using the factory Head gasket, the factory bore sealing proof stress restricts the improvement. GT800 Package can release the restriction by replacing the Head gasket with the HKS Head Gasket which enables higher performance. This HKS Head Gasket includes the Exhaust Manifold Gasket. Features Designed to replace the factory Head gasket. The bore diameter and thickness are the same as the