Air intake for Cadillac Eldorado (1993-1994) 4.6L EngineHigh Flow Air Intake for 1993 1994 Cadillac Eldorado (Northstar 4. 6L E Body) What it Does: This high flow air intake system replaces the restrictive OEM factory air box and ducting to lower intake air temperatures and improve volumetric efficiency on the 4. 6L V8 Northstar engine. The Stock Eldorado Airflow Bottleneck From the factory, the 1993 1994 Cadillac Eldorado relies on a highly baffled, enclosed plastic air box engineered primarily for noise