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Outback Model

Disconnect the ground cable from battery.
Remove the rear gate trim. Refer to REAR GATE TRIM .
Remove the noise suppressor.
1. Disconnect harness connector from noise suppressor.
2. Remove the harness clamps and bolts and detach the noise suppressor.
  
  Fig 1: Locating Noise Suppressor, Harness Clamps And Bolts (Outback Model)
  Courtesy of SUBARU OF AMERICA, INC.