Check out this article on intercooling. They basically claim the air becomes more dense that's fed into the turbocharger. That part sounds good.

http://www.freeautoadvice.com/diesel/psdintcool.html

They also say it will keep the engine temperature down a bit. You want your diesel to stay at it's optimum pretty hot temperature. I wonder how much it would actually affect the engine's temperature. I would guess not that much.

Not sure how much more boost you could handle. It might make your factory 13psi more efficient. That wouldn't be damaging, would it?

-m

__________________
Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC