The leak is where the pipes Y into the cat. I can see the gaskets under there, and they seem deteriorated, and when I touched them, some pieces flaked off. So I geuss this is probably my problem.
The diagram for the parts I will need is here:
http://www.subaruparts.com/diag/?mod...category=440-A
The gaskets look like part #8
The springs that you mentioned look like part #16
So I will need 2 donut gaskets, and it looks like 4 springs. How hard will this be to take apart and do myself? And are there any other parts I should get?