What exactly does the turbo samco hose set of three replace?

Any pics of them fitted i can't work out exactly where they go?- bear in mind im at work at not near my engine bay.



Is it worthwhile or more of a dressing?

Ancillary hosing? I know where that goes but worthwhile?

coolant? I know where that goes but worthwhile?

Are they DIY on a MY05?

Cheers
Trevor

 

I might be wrong but i thought it did have some difference. Smoother internals help spool, not sure.