What is the main advantage of the polymer construction over aluminum?

The polymer construction significantly reduces heat soak compared to aluminum intake manifolds. This helps prevent power loss, especially in boosted or high-RPM applications, and contributes to more consistent performance.

Can I use this manifold with a supercharger or turbocharger?

Yes, this manifold is specifically designed with boosted applications in mind and is rated for up to 45 PSI of continuous pressure. Its robust polymer construction is built to handle high boost levels.

What is the benefit of the removable stacks?

The removable stacks allow you to experiment with different lengths to tune the intake runners. This helps you optimize the engine's volumetric efficiency and find the combination that makes the most power for your specific application and RPM range.

FAST LSX 103mm Intake Manifold Black 146106 - LS3 Rect Port

Name: FAST LSX Manifold 103MM Gen III LS Rect Port - Black
Brand: FAST
Price: 1435.74 USD
Availability: InStock

FAST LSX Manifold 103MM Gen III LS Rect Port - Black

$1435.74

Only 4 left in stock

FAST LSXHR 103mm intake manifold for LS3/LS7 engines. Polymer construction eliminates heat soak and boosts power.

Key Features

Fits a wide range of Gen III LS engines with rectangular port cylinder heads, including LS3 and LS7 applications.
Advanced polymer construction is lightweight, strong, and virtually eliminates heat soak for improved performance.
Tunnel ram design is ideal for generating maximum power in boosted and naturally aspirated engines.
Rated for up to 45 PSI of continuous boost pressure, making it suitable for high-performance applications.
Features removable stacks of various lengths to allow tuning for optimal power across different RPM ranges.
Compound fuel injector angle aims spray for ideal atomization, improving power production and drivability.

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Will this fit your vehicle?

Product Details

This is the FAST LSXHR 103mm tunnel ram intake manifold, built for Gen III LS engines with rectangular port cylinder heads like the LS3 and LS7. If you're building a high-performance naturally aspirated or boosted engine, this manifold is designed to help you extract maximum power. It features a unique polymer construction that significantly reduces heat soak compared to traditional aluminum intakes, which can rob your engine of power. The tunnel ram design itself is a proven way to increase airflow and horsepower, especially in the upper RPM range.

What sets this FAST manifold apart is its advanced polymer material, which is both lightweight and strong, capable of handling up to 45 PSI of boost. It also includes removable stacks, allowing you to tune for optimal power delivery across different RPM bands. The fuel injector angle is specifically designed to improve atomization for better drivability and power. Plus, the reversible top means you can orient the throttle body forward or towards the firewall, giving you flexibility in your engine bay layout. For those running nitrous, there are two bosses per runner for easy direct port installation. The 103mm throttle body opening can even be matched to 105mm for further airflow potential.

This manifold fits a wide range of popular GM vehicles equipped with the correct LS engine, including models like the Cadillac Escalade, Chevrolet Camaro, and GMC Sierra. It's a serious piece of hardware for anyone looking to push the limits of their LS-powered vehicle.