Caterpillar S478 (traditional flank milled compressor)

Here is your go to genuine Borg Warner S478 coming in at 78 mm on the compressor wheel inducer (small diameter) and 88 mm on the turbine wheel exducer (again small diameter). The turbine wheel has a large diameter titled the inducer and that measurement is 96 mm. Some are unaware that both wheels have an "inducer" and an "exducer". The titles given reflect the directional flow of the gases entering and exiting the individual housings.