HKS Grommet Type Head Gasket for G16E Toyota GR Corolla (23002-AT003)23002 AT003 With pushing more horsepower and boost, many people will eventually experience the issue of head gasket failure. To address this, HKS is pleased to announce the release of a new grommet type head gasket which takes things a step further than the existing stopper type gaskets. HKS utilized and designed specifically to handle the boost pressure up to 200kPa (2kg cm2) maintaining the surface pressure and preventing gas leakage. Vehicle