Metra Electronics 70-8902 Amp Interface Harness Plugs Into Car Harness At Radio Location Retains AUX Input Provides Reverse Output Pre-wired For The ASWC-1 Amp Interface Harness Subaru Amp Interface Harness Prewired ASWC-1 Harness Included (ASWC-1 Sold Separately) Provides Reverse Output Compatible with 2012-Up Impreza, Legacy and Outback Models