Metal head gasket sets include the exhaust manifold gaskets. These are stopper type gasket with a 96mm bore meant for up to a 9:1 compression ratio.
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.
Best to use with GT800 Package to upgrade the engine properly.
* HKS Head Gasket is more durable, the pressure is applied equally comparing to the factory gasket.
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