Removing intake and PD of coolant leak

[ciaka]

I plan to remove intake to pd coolant leak that recently occured on my cayenne turbo.
Have few questions and advice from those in the know.  Thank you very much.
My CTT had coolant pipes done already and replaced with the metal ones.  Yet, another coolant leak happened so deciding to do on my own since mechanic obviously either did job wrong, or neglected to tell me of some other part that fails routinely, and now I have to take this apart again.

1.  Do I need to get new intake seals (two of them) whenever removing intake on cayenne turbo
2.  In addition to cooling pipes, what other pipes routinely fail under the intake, so I can keep an eye out.
3.  Are there parts I can get that have longer life, so I dont have to redo yet again.
4.  Any ohter advice while doing this for my car (tips, hints, items worth changing while you are there, etc)
5.  Heard there are some smaller pipes that are plastic but fail, and can be purchased metal (not sur if t-pipe or angled, etc), but if you have info withg pn, url, I will really appreciate it. 

thank you.

[ciaka]

Got that handles in another thread, just to wrap up.