There is an important part in the mechanics named the cylinder head. The location of the cylinder head is on the top of the engine block. Along with the head gasket, there is a seal over the cylinder, allowing the pistons to function and protects the engine's delicate components. It is necessary for the engine to work with vacuum condition. So if the cylinder head leaks, cracks, or sustains other damage, it can affect the engine in a negative way. Don't wait too late until the engine needs to be changed since it gets hurt by cylinder head too much. If you find anything wrong with the cylinder head, you need to stop driving immediately and check it if the replacement is necessary. Once you decide to change, we are glad to offer you all Subaru genuine OEM cylinder head with a discounted price.