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If you compare the OEM airbox on the Cadillac CT5-V Blackwing to the one on the ZL1, the Blackwing has an additional inlet near the passenger-side front fender. I’ve always suspected that extra airflow contributes to its ~18 hp advantage with the LT4—along with the wideband O2 sensor helping keep fueling in the optimal range.
You’ve confirmed what I suspected—and clearly, the Cadillac engineers felt the engine needed to breath better.
The other change is the intake tube is hard plastic instead of the rubbery tube used on the ZL1. No worries about collapsing under WOT.
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