Impreza WRX STI F4-2.5L Turbo (2008)
Front side belt tension (when not using a belt tension gauge):
When installing new parts 7 - 9 mm (0.276 - 0.354 inch)
At inspection 9 - 11 mm (0.354 - 0.433 inch)
REAR SIDE BELT
If cracks, fraying or wear is found, and when abnormal noise is produced, replace the rear side belt.
NOTE: Because the rear side belt is a stretch type belt, it is not necessary to check deflection and tension.