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FAST Intake Manifold LSXHR LS1/2/6 (Cathedral Port)

SKU: FST146303

Intake Manifolds, Fuel Injected

FST Intake Manifolds

FAST Intake Manifold LSXHR LS1/2/6 (Cathedral Port)

SKU: FST146303

Intake Manifolds, Fuel Injected

FST Intake Manifolds

A$2,746.31
LOW STOCK! Est Ship 3-5 days. HURRY! LOW STOCK. This item is in limited stock at one of our distribution centres. The ETA is the approximate time required to prepare your order for dispatch.
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Description

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.

Application Summary

Fits Cathedral Port 4.8, 5.3, 6.0 LS engines

Part Type

Engine Intake Manifold

Data: v4.2 - Upd: 2026-09-28 23:58:05

Specifications

Product Attributes - EGR
No
Product Attributes - UPC
00036584408451
Product Attributes - Brand
FAST
Product Attributes - Notes
Fits LS cathedral port cylinder heads.
Product Attributes - Quantity
Sold as a kit.
Product Attributes - Part Type
Intake Manifolds, Fuel Injected
Product Attributes - Base Color
Black
Product Attributes - Product Line
FAST LSXHR Intake Manifolds
Product Attributes - Base Material
Polymer
Product Attributes - Plenum Finish
Black
Product Attributes - Plenum Material
Polymer
Product Attributes - Runners Included
Yes
Product Attributes - Runners Removable
Yes
Product Attributes - Injectors Included
No
Product Attributes - Fuel Injection Style
Multi-port
Product Attributes - Throttle Body Included
No
Product Attributes - Intake Section Included
Complete
Product Attributes - Throttle Body Bore Size
103mm
Product Attributes - Engine Block Deck Height
Standard deck
Product Attributes - Basic Operating RPM Range
5,000-7,500
Product Attributes - Manufacturer's Part Number
146303
Product Attributes - Supplemental Boss Quantity
Sixteen
Product Attributes - Cylinder Head Configuration
Cathedral Port LS1/LS2/LS6
Product Attributes - Supplemental Bosses Cast-In
No
Product Attributes - Supplemental Bosses Machined
Yes
Product Attributes - Aftermarket Fuel Rail Required
No
Product Attributes - Multi-Port Fuel Rails Included
Yes

Reference Information

Brand Name/s Fast
StreetFX SKU fst146303
SFX Item ID 4084993
Supplier Item Code 4084993
Manufacturer SKU 146303
Manufacturer UPC N/A
Alternative References LS1/2/6

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Compatibility

Fits Cathedral Port 4.8, 5.3, 6.0 LS engines

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