Skunk2 907-05-9100 Ultra B/K- Series Silver Race Intake Manifold Spacer (+.5 Liter) All Acura B-Series (.5 Liter Spacer) All Acura K-Series (.5 Liter Spacer) All Honda B-Series (.5 Liter Spacer) All Honda K-Series (.5 Liter Spacer)