44022AA160- This is a Genuine Subaru OEM part. This gasket goes between the crossover pipe and the collector. The crossover pipe and collector are often disconnected during up pipe installs and the gasket should be replaced anytime you disconnect the crossover pipe and collector.
44022AA170- This is a Genuine Subaru OEM part, it is a multi-layer gasket and is very high quality. This gasket lies between the header and the up-pipe and provided a leak free seal. Recommended for purchase with a new up-pipe.