Presilencer and Middle Pipe Removal Note

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Remove the presilencer and the middle pipe as a single unit.
Secure the middle pipe in a vice.

Fig 1: Securing Middle Pipe In Vice
Courtesy of MAZDA MOTORS CORP.
Remove the presilencer from the middle pipe using the following procedure.
1. As shown in the figure, place alignment marks on the presilencer and the middle pipe so that they can be re-assembled to their original position.
  
  Fig 2: Identifying Alignment Mark And Nut On TWC
  Courtesy of MAZDA MOTORS CORP.
2. Loosen the nut shown in the figure.
  
  Fig 3: Identifying Alignment Mark And Nut On TWC
  Courtesy of MAZDA MOTORS CORP.
3. As shown in the figure, spread the connection area of the presilencer and the middle pipe outward using a flathead screwdriver.
  
  Fig 4: Identifying Alignment Mark And Nut On TWC
  Courtesy of MAZDA MOTORS CORP.
4. Remove the presilencer from the middle pipe in the direction of the arrow shown in the figure
NOTE:
- If the removal is difficult, the middle pipe can be removed easily by spraying penetrant lubricating spray on the connection area of the presilencer and the middle pipe.