Hi
​​​​​​Can anyone help me identify this small damaged hose please? I know I should know this but engine bays are not my strong point... It's a 2001 Forester S/Tb STi (auto). Thanks

 

It goes to the boost control solenoid. Be careful there is a brass pill in there that needs put in the new pipe.

 

The hose shown in the picture is part of the vacuum/boost control pipes.

Part number 14449AA080 and should contain a small restrictor "pill" with a very small (1.2mm dia) hole in it.
Item 1 below
The pill itself is part number 22326KA120



Image showing full setup



From your photos it is difficult to see if you actually have the tee-piece connection.

 

Brass pill?

I'll investigate YouTube for the boost control solenoid, hopefully it will become clearer.

Thanks

 

Yes, it has the tee connector. Is this why it was dying during hard acceleration? Is it safe to drive this steadily until I get the replacement? Thanks for your info btw.

 

Get a piece of window washer hose or silicone hose remove the pill from the old hose which is between the compressor outlet and the T piece. Cut to length and then a little lubrication on the pill push it into the new hose and make sure the hole in the pill is not restricted. Replace hose job done. Ten minutes max
P.S. Pill needs to be a tight ish fit in hose.

 

Not really safe to drive no boost control at all.

 

Dying cause of overboost.

 

I've just done this as a temporary measure. Had some silicone hose spare.

 

No overboost now.