Lower Engine Intake Manifold Gasket Set (AMS11391) by Apex Auto®. Position: Lower. Make sure your engine breathes properly with Apex Auto selection of top-quality replacement air intake parts. These parts are made by trusted brand that use the finest materials and the latest manufacturing techniques. As a result, all air intake components stocked in online store meet the strictest quality standards and are guaranteed to perform at their best for a long time. Made for your specific vehicle, they install without any modifications.