Yes, the BD-Power 1047511 Turbo Thruster II will lower EGT’s on a modified 7.3L. The turbo doesn’t come with one of the billet compressor wheel. BD has the ability to machine the compressor housing in a way that they can actually use a larger wheel than the common billet replacement.
No, unfortunately the turbo will not work with the early 99 7.3L applications.
The BD-POWER 1047511 TURBO THRUSTER II (CALIFORNIA EDITION) utilizes a 0.8 A/R turbine housing and is California compliant.
The BD-POWER 1047510 TURBO THRUSTER II utilizes a 1.0 A/R turbine housing and is NOT California compliant.