AVCS Oil Control Valve 10921AA140 Synthetic It also contains some components

It also contains some components with the intention of allowing for "tuning" of the differential operation for various motorsport conditions

RIGID DIFF MOUNTING

Manufacturer Part No: 21311AA120

The plug gaps are controlled with laser precision throughout the manufacturing process and should not be re-gapped unless absolutely necessary (due to the fragility of the center electrode)

AVCS Oil Control Valve 10921AA140 Synthetic It also contains some componentsThe AVCS intake oil control valve (solenoid) controls oil flow to the camshaft sprocket as part of the variable valve timing (VVT) system. It installs into the cylinder head's front cam bearing cap assembly. A sticking or faulty oil control valve may set a fault code and require replacement. The AVCS (Active Valve Control System) is used by Subaru to vary the camshaft timing in order to improve efficiency and reduce emissions across the rpm range. The