Ford 429 460 MID-AIR™ MidRise Aluminum Intake Manifold [Black] The Speedmaster Snapback cap is

The Speedmaster Snapback cap is a pre-curved bill Baseball style hat

where dynamic flow and rock-steady pressure control are desired

while increasing thermal conductivity

These Speedmaster gasket kit sets include premium-quality head gaskets

Speedmaster brackets are constructed from durable steel

Ford 429 460 MID-AIR™ MidRise Aluminum Intake Manifold [Black] The Speedmaster Snapback cap isThe Speedmaster MidRise Air design features the identical plenum and runner design as the normal MidRise. 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 and torque.