Exhaust Header Gasket

The J2 Engineering exhaust header gasket is engineered to provide a sealed combustion barrier between your header and cylinder head. This gasket is constructed to withstand the demanding thermal cycling and pressure cycles inherent in exhaust systems, actively resisting blow-by and exhaust leaks at the header flange without premature breakdown. Featuring a heat-resistant core, this gasket is built to endure sustained high temperatures from the exhaust manifold without warping or leaking. Its precision flange fit ensures it seats flush against the cylinder head, preventing gaps or misalignment issues that could lead to leaks. As a single gasket design, it serves as a direct replacement for OEM applications on compatible vehicles. This gasket is specifically designed for the 2005–2010 Chevrolet Cobalt and HHR platforms with 2.2L and 2.4L non-turbo inline-4 engines. It is crucial to note that this gasket does not fit the Cobalt 2.0L supercharged models and will not fit vehicles equipped with an EGR port on stock manifolds. For optimal performance and sealing, it is recommended to scrape off all old gasket material and carbon buildup from both the header and cylinder head flanges before installation, ensuring a clean and flat surface.