Help with (possibly) butchered CM870

[Rig Wrench]

Depending on what your doing, the 870s do very well with the fixed vane turbo so long as the tune is correct. The air vgt is somewhat inferior to the 871 electronic vgt. The fixed vane does help drop back pressure for high torque load applications. I'd just have one of the aforementioned verify the cal is safe. Wore fuel system components will cause a bit of a rough idle, but soo won't increased timing and fuel in the idle areas.