OBVIOUSLY (unless your a fookin dumbass ) 20psi with a small turbo is less volume air than 20psi with a big ol turbo.

BUT what about in cyl pressures? I guess as its pressure and not volume that stays the same?

As in a T2 running 20psi means the same in cyl pressure as a T4 running 20psi.

Yea?

The pressure is caused by the exhaust backpressure from the small T2 ex housing, so it same in cyl pressure as the T4, even tho the T4 is flowing LOADS more air, due to lot less backpressure cause of the bigger housing.

That right? No matter how big or small the turbo, a set boost pressure would give a set in cyl pressure. 90% sure it right, but somtimes you missing out the obvious so best to ask...