Subaru OEM Differential Gasket R180 - 00-20 JDM STI & 2004-2020 Subaru STI RB25DE -The valve seal utilizes a

-The valve seal utilizes a high temperature resistant o-ring that is clamped in place to prevent the possibility of sticking to the seat and pulling out

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The CAS bracket itself has a -16 ORB fitting inbuilt which then holds in a double o-ring slip collar that seals the head to the PRO Cas bracket

with thicker piston crowns (to prevent ringland failure) With this improvement more can be thrown at this bottom end than your average 2

Subaru OEM Differential Gasket R180 - 00-20 JDM STI & 2004-2020 Subaru STI RB25DE -The valve seal utilizes aDifferential Carrier Gasket. Seals between the Differential Cover and the Differential Housing.