Seriously it does seem a problem on these doesnt it

Symptoms are:
Slight whoosh sound and shocking mpg, havnt noticed masses of black smoke and it still pulls very well.
Two things ive noticed are breather piper at top of engine is split so i taped it up and then noticed the joint on the rubber hose to the left of it shown in this pic is loose, opens up about 2mm and has oil build up under it.

After taping up the breather and wiggling that pipe my mpg went up straight away but then after a bit of driving it dropped off again.
Can these two pipes cause boost leak issues?
Cant see any others failing and IC looks fine.
Any help will be great.