FAST Engine Intake Manifold Runner

FAST Intake Manifold Runners: Engineered for LS Performance

FAST (Fuel Air Spark Technology) has built its reputation as one of the most serious names in performance induction, and nowhere is that expertise more evident than in their approach to engine intake manifold runners. Rather than treating the runner as a fixed, one-size-fits-all component, FAST engineered an entirely modular system around their acclaimed LSXR 102mm intake manifold platform — giving GM LS engine builders a level of tunability that simply didn't exist before.

The Patented Removable Runner System

What sets FAST apart in this category is a truly unique approach to runner architecture. Due to a patented removable runner design and the introduction of multiple runner sets, LSXR 102mm Intake Manifolds from FAST now have the capability to shift torque and horsepower gains to a higher RPM than the original version, making them the most flexible options on the market. This means a single manifold can evolve with your build — moving from mild street duty to high-RPM race use simply by swapping the runner set.

The runners are interchangeable and available in kits so manifolds may be configured as the original LSXR with standard street runners, or the newer High HP or Race models. A master kit is also available featuring an intake manifold assembly and all three runner options.

Three Runner Configurations to Match Your Build

In addition to the original FAST LSXR 102mm Intake Manifold and Runner Set, High HP and Race versions are available. The new interchangeable runners are designed specifically for LS3, L99, L76, and L92 engines built for high-performance applications.

• Street Runners: Provide bolt-on performance gains without any loss in bottom-end drivability, featuring a standard design suited for mild street-oriented applications.
• High HP Runners: Based on Daytona Prototype intakes and utilizing newly designed runners that are shorter and straighter than conventional versions, the High HP version has been proven to make 8–10 horsepower over the original LSXR manifold with a 500–1000 RPM shift up in peak horsepower on LS3 performance engines.
• Race Runners: The Race Runner Set features a short and straight runner design that rivals aluminum four-barrel intakes on horsepower potential. This setup utilizes a race version of standard runners designed for all-out high-RPM performance, ideal for race vehicles with serious performance modifications and race converters. The Race version provides a 15–30 horsepower gain with a 1000–2000 RPM shift up in peak horsepower.

Advanced Polymer Construction

The runners themselves benefit from the same advanced material science applied to the full LSXR manifold platform. FAST engineers teamed up with airflow specialists at RHS to develop a 3-piece, polymer intake manifold, constructed from a proprietary advanced polymer material that offers a host of benefits over aluminum aftermarket intakes, including lighter weight and improved strength and heat dissipating characteristics. Individual runner replacement parts — including left-hand, right-hand, and cylinder-specific pieces — are available separately, so you can replace a single damaged component without purchasing an entire assembly.

Bolt-On Fitment, Race-Ready Features

The 3-piece modular design allows for easy disassembly and porting, giving you the ability to remove individual runners from the manifold for further modification. Other features include integrated nitrous bungs and perfect bolt-on fitment that allows the use of factory accessories without modification or clearance concerns. Whether you are building a weekend street machine or a dedicated race car, FAST's intake manifold runner lineup delivers a measurable, tuneable performance advantage for the GM LS platform.