Intake Manifolds

Is your engine running out of breath at the top of the rev range after your other modifications? A new intake manifold distributes the air from the throttle body to the cylinders and can shift where the engine makes the most power. This category is for you if you have an engine project on, for example, Honda K, B or L engines or a V8 such as the Hemi or Ford Coyote.

What an intake manifold changes

The manifold routes air from the throttle body to each cylinder. The length and diameter of the runners and the volume of the plenum affect the rev range in which the engine fills best. Long, narrow runners can typically give more low-end torque, while short runners and a larger plenum often move the power higher up. At Skunk2 Racing, for example, you will find both Street and Race versions, and some variants are marked for track use.

How to choose the right manifold

• Engine code: Fitment follows the engine, e.g. K20, K24, B18C1, L15B7 or Gen III Hemi, not just the car model.
• Power goals and use: Match the runner design to your camshafts, exhaust and the rev range you actually drive in.
• Throttle body and flange: Check whether your current throttle body fits or whether you need to choose a new one from our throttle bodies.
• Space and connections: Height under the bonnet, fuel rail, injectors and sensors.

Changed airflow typically requires the engine management to be adjusted. Whether a manifold can be approved for roadworthiness inspection depends on the product and the car, so check this for the specific part number.

Installation and accessories

Always use new gaskets. Some manifolds are supplied without them and require a separate gasket kit, e.g. from Edelbrock. If the manifold or throttle body needs to be mounted with spacing, you will find intake manifold spacers and throttle body spacers; whether they fit depends on the specific combination. Other brands in the category are Wehrli, AMS and S&S Cycle.

Frequently asked questions

What do Street and Race mean on an intake manifold?

The designations follow the manufacturer's versions. Race variants typically have runners and a plenum aimed at high revs, and products marked 'Race Only' are intended for track use. Check the description for the specific part number.

Does the engine management need adjusting after changing the manifold?

Often, yes. Changed airflow can affect the air-fuel ratio, and some manifolds change the position of sensors or injectors. The extent depends on the manifold, the engine and your other modifications, so plan for an adjustment of the map.

Can I reuse the old manifold gasket?

This is not recommended. A used gasket can cause vacuum leaks, which can lead to a rough idle and an incorrect mixture. Some manifolds are supplied without gaskets, so check the product description to see whether you need to order a gasket kit separately.