Mopar Chrysler Dodge SB 318 340 360 MID-AIR™ MidRise Aluminum Intake Manifold [Satin] Permanent molds provide a tighter

Permanent molds provide a tighter grain casting thereby reducing the occurrence of porosity which can mar the polished finish

Aggressive

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Available with show polished or satin (unpolished) finish

They feature bodies and / or secondary towers and feature brass secondary contacts (except direct fire coil on plug applications)

Mopar Chrysler Dodge SB 318 340 360 MID-AIR™ MidRise Aluminum Intake Manifold [Satin] Permanent molds provide a tighterThe 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.