---
product_id: 18530274
title: "LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads"
brand: "fast"
price: "€ 2527.46"
currency: EUR
in_stock: true
reviews_count: 6
url: https://www.desertcart.de/products/18530274-lsxrt-102mm-intake-manifold-for-gm-ls-4-8-5
store_origin: DE
region: Germany
---

# Modular Design 102mm Inlet 21.8 lbs Weight LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads

**Brand:** fast
**Price:** € 2527.46
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate Your Ride with LSXrt Power!

## Quick Answers

- **What is this?** LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads by fast
- **How much does it cost?** € 2527.46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/18530274-lsxrt-102mm-intake-manifold-for-gm-ls-4-8-5)

## Best For

- fast enthusiasts

## Why This Product

- Trusted fast brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy Customization:** Multi-layer modular design allows for effortless disassembly and porting.
- • **Unleash Your Power:** Experience significant rear-wheel horsepower gains while maintaining factory fitment.
- • **High Flow Efficiency:** Works seamlessly with 90, 92, or 102mm throttle bodies for minimal restriction.
- • **Lightweight Innovation:** Crafted from advanced polymer for strength and optimal cooling of intake charge.
- • **Versatile Compatibility:** Designed for GM 4.8/5.3/6.0L engines and LS1, -2, -6 race applications.

## Overview

The LSXrt 102mm Intake Manifold is engineered for late model GM 4.8/5.3/6.0L truck engines, featuring a lightweight, advanced polymer construction that enhances power and efficiency. Its modular design allows for easy customization, making it the perfect upgrade for performance enthusiasts looking to maximize horsepower while retaining factory fitment.

## 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.

## 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

![LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads - Image 1](https://m.media-amazon.com/images/I/71FLPOoDFRL.jpg)
![LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads - Image 2](https://m.media-amazon.com/images/I/6197wfP1EXL.jpg)
![LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads - 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!

### ⭐ Does not fit a 2008 Chevy Tahoe!
*by J***. on August 7, 2021*

We took everything to the professionals to be installed and it's not made for our 2008 Chevy Tahoe. It does not fit at all! Falsely advertised!

## Frequently Bought Together

- LSXrt 102mm Intake Manifold for GM LS 4.8/5.3/6.0L Truck with Cathedral Port Heads
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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-01-24*