That is the question

Some people have told me my ERST need to have some back pressure to keep the oil seals in the turbo ok, others have told me that it doesn't as the gases need to flow out as quickly as possible.

I'd be grateful if someone could confirm this as I hatching a cunning plan.

It isn't running a standard set up, so I am wondering if this would make any difference?

K&N Filter (with cold air feed)
Full 2.5" stainless with one backbox and 3" tail
Turbosystems 195 chip
running 14psi

Cheers for the help guys