Intake Manifolds, Plenums & Spacers

Maximize volumetric efficiency, ensure equal airflow distribution to every cylinder, and unlock massive top-end power with high-performance intake manifolds, plenums, and spacers. The intake manifold acts as the central respiratory hub of your engine. Factory cast-iron and composite plastic manifolds are typically engineered for low-cost mass production, featuring narrow, restrictive runners and rough internal surfaces that limit high-RPM breathing and can crack or warp under high boost pressure. Upgrading to a performance manifold fundamentally changes your engine’s power band, delivering increased horsepower, torque, and throttle response for naturally aspirated and forced-induction builds.

Whether you are building a track-dedicated race car with a fabricated sheet metal EFI manifold, converting a classic muscle car with a high-flow carbureted intake manifold, or completing an LS-swap, optimizing your induction hardware is critical. Fine-tune your air path and throttle body mounting with high-volume intake plenums, angled intake elbows, and custom valley covers. To further enhance power, add a thermal phenolic intake spacer to isolate the manifold from radiant engine block heat, lowering intake air temperatures (IATs) and increasing total plenum volume. Explore our comprehensive selection of cast aluminum, sheet metal, composite intake manifolds, and essential mounting components.