Performance Intake Manifolds

The best intake manifolds for most builders are the Process West Street Version manifolds for Subaru WRX and WRX STI, which suit road-driven turbo cars, while the Process West Track Version with reverse throttle position suits more committed builds. This collection also covers Honda Civic Si manifold adapters from PRL Motorsports and a Weapon R manifold for Mitsubishi EVO 8 and EVO 9. Check your year and model carefully, because throttle position, cable or drive-by-wire setup, and tumbler-delete requirements change by application.

An intake manifold distributes air from the throttle body to each cylinder. On a turbo Subaru, replacing the factory manifold is usually part of a larger build, paired with intercooler piping changes, tumbler deletes, or a reversed throttle position to shorten the charge path. Look at whether a kit includes tumbler deletes, whether it is the Street or Track version, and what throttle body it is designed to work with before you buy.

For Honda applications, the parts are adapters rather than complete manifolds, letting a 2012-2015 Civic Si work with RBC or RRC manifolds or a larger 70mm throttle body.

Process West dominates this collection and is known among Subaru owners for turbo support hardware, including intercoolers and intake manifolds. Its Street Version appears here for STI applications such as the Process West Intake Manifold Street Version Black for Subaru STI and for 2002-2005 WRX, while the Process West Track Version with reverse throttle position is aimed at builds reworking their piping layout.

PRL Motorsports is known for Honda and modern turbo-car intake and charge-pipe parts, and here that focus shows up as precision adapter hardware. The PRL RBC / RRC Intake Manifold Adapter Flange for 2012-2015 Civic Si is a good example: a small part that makes a popular manifold swap possible when the bolt patterns do not line up directly.

Weapon R contributes a racing intake manifold for the Mitsubishi Eclipse and a manifold for EVO 8 and EVO 9, giving Mitsubishi owners in this collection a complete-manifold option rather than an adapter. Shoppers planning the supporting parts can also browse performance throttle bodies and the wider air induction range, and read our guide on the differences between intake systems.

Do I need a tune after changing an intake manifold?

Plan on tuning support for most manifold, tumbler-delete, or throttle-body changes, because airflow and sensor behaviour can change. Confirm with your tuner before the install, especially on a turbo Subaru build.

What is the difference between Street and Track Process West manifolds?

As listed here, the Street Version keeps a conventional layout for road cars, while Track Version parts use a reverse throttle position aimed at custom piping setups. Check the exact listing for your year, model, and throttle type.

Will a PRL adapter fit my Civic Si?

The PRL adapters in this collection are listed for 2012-2015 Honda Civic Si and for specific RBC, RRC, or 70mm throttle-body combinations. Match all three parts, not just the car, before ordering.

Is an intake manifold a good first modification?

Usually not on its own. Most owners address the intake, intercooler, and exhaust path first, then add a manifold when the build needs it and tuning is already planned.