I'm not sure about the hose, i put about 50+k miles on the B18C1 before I had the turbo put on and I never noticed it running a bit odd.

A bit more on the story of what happened, I was paying for the turbo kit with an insurance settlement, the shop knew this, my knock sensor was working fine when the car went in, but it was broken when it came out of the shop.
They allso do resleeving and offered to fix it for the "low" price of $3k.
The shop refused to fix the engine so I am taking them to court.