* 2.5L EJ251 (and variants): Interference This is the more common engine in the 2000 Outback. In an interference engine, if the timing belt breaks, the pistons can collide with the valves, causing significant damage.
* 2.2L EJ22: Non-interference This engine is less common in the 2000 Outback. In a non-interference engine, a broken timing belt is less catastrophic, although other damage is still possible.
Therefore, you must know the specific engine code (EJ251 or EJ22) to definitively answer whether it's interference or non-interference. The VIN will help identify this.