Whenever doing head or short block engine work, it is very important to replace old or worn engine gaskets. Nobody wants to have to pull an engine because they forgot to replace an old seal or gasket. You can save time and money with a genuine Subaru OEM full gasket and seal kit for your STI. This kit comes complete with every gasket or seal that you could possibly need when doing any level of engine work including, head gaskets, valve cover gaskets, spark plug O-rings, intake manifold gaskets and more. The full kit contains over 160 individual gaskets and seals. We strongly suggest this kit for any engine rebuild or upgrade.