2002 non egr isx 500 cm570 - turbo question

[ktbtrucking]

helo all,
have a truck with I believe cm570. It is isx 500 non egr isx. My boost gauge is from 0 to 30max.
Checked it on insite had 18psi max a little more than a half on the gauge. . My other truck cm870 have around 34max psi and the gauge is from 0 to 45.Just curious. Any thoughts regarding this. As far as I read over in the past it is hard to "kill" the turbo on cm 570 because it just spin but is not as efficient as should be. It is non Vgt turbo.
Thank you