Hey gang,

I'm having a turbo rebuilt for me, but my source doesn't have any usable .48 AR TII exhaust housings. He does have an older TI unit, however.

From what I know the older units had less nickel (stamped with M3 instead of M4). I'm not sure if this would make a real world difference for me as I never plan on going above 15psi or officially racing the car.

What I don't know is this: Is there ANY flow difference between the two units? When I asked the shop this question, I never received an email response.

Anybody with knowledge of the differences between these two parts, please chime in!