FAST Intake Manifold LSXHR LS1/2/6 (Cathedral Port)
FAST Intake Manifold LSXHR LS1/2/6 (Cathedral Port)
SKU:146303
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The FAST LSXHR 103mm Intake Manifold is a high-performance intake component designed for maximum power output in boosted and naturally aspirated GM LS cathedral port engines. Constructed from lightweight, durable polymer, it effectively reduces heat soak compared to aluminum manifolds, enhancing overall efficiency. Key features include removable velocity stacks with options for medium and short lengths, allowing racers to customize runner lengths for optimal power across a broad RPM range of 5,000 to 7,500. The manifold is optimized to deliver over 20 horsepower gains over competing tunnel ram designs and is rated for up to 45psi of continuous boost pressure. Additional features include a reversible top for flexible throttle body installation, integrated nitrous nozzle bosses for direct port systems, and a port-matched throttle opening up to 105mm for enhanced airflow and performance.
Designed specifically for GM LS engines with cathedral port heads, this intake manifold fits LS1, LS2, and LS6 applications. It is ideal for racing, high-performance street use, and boosted applications, providing a significant power increase and improved drivability. The kit includes custom fuel rails and hardware for straightforward installation, with compatibility for forward- or firewall-facing throttle bodies. Its adjustable velocity stacks and robust construction make it suitable for enthusiasts seeking to maximize engine output and tuning flexibility. This bolt-on upgrade enhances engine performance in a variety of racing and high-performance scenarios, offering a versatile and reliable solution for serious LS engine builders.
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Overview
Overview
The FAST LSXHR 103mm Intake Manifold is ideal for generating maximum power in boosted and naturally aspirated GM LS cathedral port engines. It ships with a set of tall removeable velocity stacks, however medium and short stack options can be purchased separately. This allows interchanging of the various runner lengths so racers can experiment with finding which combination makes the most power in their application. Its polymer construction is lightweight, very strong and virtually eliminates power-robbing heat soak that occurs with commonly available aluminum intake manifolds. The manifold has been optimized to make power from 5,000 to 7,500 RPM, with testing showing 20+ horsepower gains over competitor tunnel ram intake manifolds. The FAST LSXHR 103mm Intake Manifold is designed specifically with boosted applications in mind and is rated for up to 45psi of continuous boost pressure. The compound fuel injector angle aims the spray pattern for ideal atomization, resulting in maximum power production and superior drivability. Also included with the intake manifold are custom fuel rails and necessary hardware. A reversible top allows for forward- or firewall-facing throttle body installations. The intake manifold also features two nitrous nozzle bosses per runner for clean and easy direct port system installations. Additionally, its 103mm throttle body opening can be port matched up to 105mm.
