90mm Ultra Side Feed Intake Manifold K Series K20 K24 4.78L90MM SIDE FEED INTAKE MANIFOLD K SERIES K20 K24 4. 78L PLENUM EG EK DC2 CIVIC RSX The 90mm Side Feed Intake Manifold is designed for use with K Series engines, specifically the K20 and K24 with a 4. 78L plenum. This intake manifold is compatible with the EG, EK, and DC2 Civic and RSX models. It features a side feed design which is known to increase airflow and horsepower. This product is made of high quality materials and is built to withstand the