LSXHR 103mm Intake Manifold for Rectangular Port LS3 High Ram High Rise Inlet Manifold (LSXR)
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Description
FAST 146106 LSXHR 103mm High-Rise Intake Manifold – LS3 Rectangular Port
Fits: GM LS engines using LS3-style rectangular-port cylinder heads.
Built for serious naturally aspirated, turbo and supercharged LS combinations. The FAST LSXHR uses a high-rise tunnel-ram design with interchangeable velocity stacks, allowing runner length to be tuned to suit the engine combination.
FAST testing recorded an average 30 HP gain from 5,000–7,500 RPM over competing high-rise intake manifolds. Lightweight polymer construction reduces heat soak, while the manifold is rated for up to 45 psi continuous pressure.
FAST 146106 Specifications & Kit contents:
- FAST LSXHR polymer intake manifold
- Removable tall velocity stacks - yes included
- Fuel rails - Yes included
- Intake port seals - yes included
- Required installation hardware
| Part number | 146106 |
|---|---|
| Intake type | High-rise tunnel ram |
| fITS Cylinder-head port | LS3 rectangular port LS3/L76/L92/ L98/ L99 / LSX |
| Throttle-body opening | 103mm; port-matchable to 105mm |
| Operating range | Optimised for 5,000–7,500 RPM |
| Pressure rating | Up to 45 psi continuous pressure |
| Construction | Lightweight polymer |
| Velocity stacks | Removable tall stacks included; medium and short stacks available separately |
| Throttle body included | No |
| Fuel injectors included | No |
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More Information
FAST LSXHR Intake Manifold for Boosted and High-RPM LS Engines
The FAST 146106 is designed for LS3 rectangular-port applications requiring greater high-RPM airflow than a conventional low-profile intake manifold. It suits turbocharged, supercharged, nitrous and large-capacity naturally aspirated LS engine combinations.
The interchangeable velocity-stack system allows the runner length to be changed using optional medium or short FAST stacks. The reversible upper provides forward-facing or firewall-facing throttle-body mounting, giving the engine builder more freedom when planning intake plumbing.
A compound fuel-injector angle directs the spray pattern towards the intake port for improved fuel targeting and atomisation. Two nitrous nozzle bosses per runner are also provided for clean direct-port nitrous installations.
Check bonnet clearance, throttle-body position, injector compatibility and fuel-system requirements before installation. This is a high-rise manifold and may require additional clearance compared with a factory-style LS intake.
Warranty
12
Features
Lightweight and strong polymer construction;Virtually eliminates heat soak;Average 30 HP gain over competitor tunnel ram manifolds;Rated for up to 45psi of boost pressure;Forward- or firewall-facing throttle body installation;Available for rectangular LS3 and raised port LS7 engines
Specifications
| SKU | 146106 |
| Barcode # | 036584097457 |
| Brand | FAST |
| Title | LSXHR 103mm Intake Manifold for Rectangular Port LS3 |
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