Crosswind EFI Conversion Intake ManifoldThe CrossWind design features the identical plenum and runner design as the Typhoon. The main difference is that there is an open area under the plenum chamber. This feature is sometimes called an air gap design. The air flowing under the plenum provides a cooler charge for the incoming air with less heat transfer from the engine. This cooler air charge provides additional power. The CrossWind design is very popular. Includes nitrous bosses.