Subaru requires the Timing Belt to be replaced at 105,000 miles.
We recommend replacing the timing belt at or around 90,000 miles because when this is done, it allows the mechanic to inspect many different critical engine components including the oil pump and water pump, and if there are any issues, those can be delt with before the problems become more severe.
This Timing belt fits:
02 - 07 WRX
04 - 07 STI
05 - 09 Legacy GT
05 - 09 Outback XT
04 - 07 Forester XT
The Subaru Part number for this belt is 13028AA240.
Professional installation is very strongly recommended.