Hi all! back to subaru again!!

[Rabidgerbil59]

I've owned a few subbie over the years.Picked up a 04 outback reasonable recently cause former owner thought it was ok to run 4 different size tires with AWD clearly was not.New rear differential and driveshaft later and I'm back!!! quick question though timing belt on the legacy/outback is different apparently than other 2.5 sohc models what is the purpose of that?