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Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
Authorized Brand Dealer
Fulfillment From Multiple U.S. Warehouses
Enthusiast Owned & Supported
Easy Financing Available!
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FAST LSXHR 103mm Intake Manifold for GM LS1/LS2/LS6 Cathedral Port Engines - 146303
$1,249.95
This product will be available for sale in 2 weeks, but you can pre-order now to receive 10% discount!
Designed for maximum power in both boosted and naturally aspirated applications, the FAST LSXHR 103mm Intake Manifold is a tunnel-ram style polymer manifold optimized for GM LS cathedral port engines (LS1, LS2, and LS6). Engineered to withstand continuous boost pressures up to 45psi, this manifold features a lightweight polymer construction that resists power-robbing heat soak compared to traditional aluminum designs.
The LSXHR features a modular design with interchangeable velocity stacks, allowing tuners to find the ideal runner length for their specific RPM range. The compound fuel injector angle is specifically positioned to improve fuel atomization for better drivability and power production. For versatile packaging, the reversible top plate allows for either forward- or firewall-facing throttle body mounting. Each runner includes two integrated nitrous nozzle bosses for a clean direct-port installation.
- Manufacturer Part Number: 146303
- Engine Compatibility: GM LS1, LS2, LS6 (Cathedral Port)
- Throttle Body Opening: 103mm (Port matchable up to 105mm)
- Boost Rating: Up to 45psi continuous pressure
- RPM Range: Optimized for 5,000 to 7,500 RPM
- Runner Design: Includes tall removable velocity stacks (medium and short sold separately)
- Construction: High-strength, heat-resistant polymer
- Included Hardware: Custom fuel rails and installation hardware
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FAST LSXHR 103mm Intake Manifold for GM LS1/LS2/LS6 Cathedral Port Engines - 146303
$1,249.95
This product will be available soon, but you can pre-order now to get on the list before others!
US Based Support - In Florida
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$1,249.95
$1,249.95
$1,249.95
Designed for maximum power in both boosted and naturally aspirated applications, the FAST LSXHR 103mm Intake Manifold is a tunnel-ram style polymer manifold optimized for GM LS cathedral port engines (LS1, LS2, and LS6). Engineered to withstand continuous boost pressures up to 45psi, this manifold features a lightweight polymer construction that resists power-robbing heat soak compared to traditional aluminum designs.
The LSXHR features a modular design with interchangeable velocity stacks, allowing tuners to find the ideal runner length for their specific RPM range. The compound fuel injector angle is specifically positioned to improve fuel atomization for better drivability and power production. For versatile packaging, the reversible top plate allows for either forward- or firewall-facing throttle body mounting. Each runner includes two integrated nitrous nozzle bosses for a clean direct-port installation.
- Manufacturer Part Number: 146303
- Engine Compatibility: GM LS1, LS2, LS6 (Cathedral Port)
- Throttle Body Opening: 103mm (Port matchable up to 105mm)
- Boost Rating: Up to 45psi continuous pressure
- RPM Range: Optimized for 5,000 to 7,500 RPM
- Runner Design: Includes tall removable velocity stacks (medium and short sold separately)
- Construction: High-strength, heat-resistant polymer
- Included Hardware: Custom fuel rails and installation hardware
📘 Guides & Manuals
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