---
product_id: 18530274
title: "146602B"
price: "€ 2403.72"
currency: EUR
in_stock: null
reviews_count: 6
url: https://www.desertcart.fr/products/18530274-146602b
store_origin: FR
region: France
---

# Polymer design reduces heat soak 102mm inlet for max airflow Modular removable runners 146602B

**Price:** € 2403.72
**Availability:** ❌ Out of Stock

## Summary

> 🚀 Elevate your LS truck’s power with precision airflow engineering!

## Quick Answers

- **What is this?** 146602B
- **How much does it cost?** € 2403.72 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/18530274-146602b)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Customizable Porting:** Multi-layer modular design with removable runners lets you fine-tune airflow and performance with ease.
- • **Boost Your Horsepower:** Unlock up to 25 peak rear-wheel HP gains on stock 6.0L engines with the Big Mouth 102mm throttle body.
- • **Lightweight & Durable:** Advanced injection-molded polymer construction delivers strength and cuts weight while cooling intake charge.
- • **Tailored Fit, Zero Compromise:** Precision bolt-on fit maintains factory accessories and OEM fuel/emission connections—no clearance headaches.
- • **Versatile Throttle Body Compatibility:** Works seamlessly with 90mm, 92mm, or 102mm throttle bodies for flexible upgrade paths.

## Overview

The FAST LSXrt 102mm Cathedral Port Intake Manifold (model 146602B) is engineered for GM 4.8/5.3/6.0L LS trucks and LS1/-2/-6 race engines. Featuring a modular, removable runner design and a large 102mm inlet, it delivers up to 25 peak horsepower gains while maintaining factory fitment and clearance. Constructed from a proprietary lightweight polymer, it reduces heat soak and supports multiple throttle body sizes, making it a versatile, high-performance upgrade for serious enthusiasts.

## Description

Designed specifically for GM 4.8/5.3/6.0L LS cathedral port truck engines and cathedral port LS1, -2, -6 race applications where hood clearance is not a concern. The FAST LSXrt 102mm Intake Manifold follows the path chartered by the original FAST LSX Gen III Intake by featuring a modular design that allows for easy porting and disassembly and a runner design that yields an incredible 25 peak horsepower gain over the stock intake, on a stock 6.0L engine with a Big Mouth 102mm Throttle Body. And similar to the LSXr 102mm Intake Manifold for cars, the LSXrt features the ability to remove individual runners for modification. The LSXrt is constructed from a proprietary precision injection molded polymer which offers many benefits, including lighter weight, greater strength and lower heat soak propensity. While it features a 102mm air inlet that was designed for the FAST Big Mouth 102mm Throttle Body, it can also be used with stock 90mm or aftermarket 92mm throttle bodies (78mm three-bolt throttle bodies require an adapter). Other features include integrated nitrous bungs and precise bolt-on fit that permits the use of factory accessories and OEM fuel/emission connections without adjustments or clearance issues. Some GM truck models may require the FAST 92mm or 102mm throttle body.

Review: Amazing - Bought this last year and I cannot be happier. Instructions were easy to follow and had it on within a few hours. If you have regular hand tools you should be able to complete this right away. If you have problems with it, you probably installed it wrong. lol
Review: Fast Customer service is poor at best! - Extremely disappointed with Fast in general, fuel rails do not fit injectors properly after following Fast representatives guidance on product selection, and after repeated attempts to contact Fast there is no resolution, my experience has been extremely negative regarding the following, customer service product quality and installation. Wish I could give it zero or negative stars!

## Features

- Designed for late model GM 4.8/5.3/6.0L port truck engines and all LS1, -2, -6 based engine race applications with appropriate cowl clearance.
- Multi-layer modular design with removable runners for easy disassembly and porting.
- 102mm inlet works with 90, 92, or 102mm throttle bodies for high flow and minimal restriction.
- Advanced polymer material is strong, lightweight and cools intake charge for enhanced power.
- Big gains in rear-wheel hp yet retains factory fitments and under-hood clearance requirements.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | COMP Cams |
| Brand | FAST |
| Model | LSXrt 102mm Cathedral Port Intake Manifold for 4.8, 5.3 and 6.0L LS Trucks |
| Item Weight | 21.8 pounds |
| Product Dimensions | 24.9 x 16 x 13.4 inches |
| Item model number | 146602B |
| Exterior | Machined |
| Manufacturer Part Number | 146602B |
| OEM Part Number | N |

## Images

![146602B - Image 1](https://m.media-amazon.com/images/I/6197wfP1EXL.jpg)
![146602B - Image 2](https://m.media-amazon.com/images/I/71FLPOoDFRL.jpg)
![146602B - Image 3](https://m.media-amazon.com/images/I/81RXG3I3pOL.jpg)

## Questions & Answers

**Q: What throttle body it use for 04 ls 6.0??**
A: We do not offer a drive by wire throttle body. But any LS throttle body should work. We have an adapter for the three bolt throttle bodies.

**Q: Is this Carb approved for use in Ca vehicles?**
A: The manifold is 50-State Legal (CARB EO #D-279-9)

**Q: Would the stock fuel rails and throttle body from a 2005 5.3 fit this lsxrt intake?**
A: Yes, you can use the stock rails. You will need fuel rail kit 146030-kit to make them work. Also, if you have the three bolt throttle body, you will need an adapter plate 146029-kit.

**Q: Will this fit on a lsx b8 6.2l?**
A: If you have cathedral port cylinder heads, the intake should work. Otherwise, it will not. Also, if this is not for a truck application, it will likely not clear your hood.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Amazing
*by E***N on September 21, 2020*

Bought this last year and I cannot be happier. Instructions were easy to follow and had it on within a few hours. If you have regular hand tools you should be able to complete this right away. If you have problems with it, you probably installed it wrong. lol

### ⭐ Fast Customer service is poor at best!
*by S***E on February 5, 2020*

Extremely disappointed with Fast in general, fuel rails do not fit injectors properly after following Fast representatives guidance on product selection, and after repeated attempts to contact Fast there is no resolution, my experience has been extremely negative regarding the following, customer service product quality and installation. Wish I could give it zero or negative stars!

### ⭐⭐⭐⭐⭐ STOCK 99-06 truck throttle bracket works
*by B***R on December 17, 2021*

Nice intake as expected I did look for what bracket would fit before I bought it. Planned on building one but the stock gen 3 truck one fits and has cruise. Overall nice piece. Expensive but everything is.

## Frequently Bought Together

- LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads
- Camshaft Retainer Plate Gasket Compatible with LS Series Engines, &Bolt Kit ARP 134-1003 Gen III IV V for GM LS1 LS2 LS3 4.8 5.3L 6.0L 6.2L Vortec Corvette Cam
- MSCRP AN4 Fuel Brake Line,LS Coolant Crossover Steam Vent Kit LS Stainless Coolant Crossover Steam Vent Kit Compatible with for LS1, LS2, LS3, LS6, LS7, LS9, LSX

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**Shop now:** [https://www.desertcart.fr/products/18530274-146602b](https://www.desertcart.fr/products/18530274-146602b)

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-01-27*