---
product_id: 6402310
title: "FAST 54103 Big Mouth 102mm Throttle Body w/TPS & IAC Sensors - FAST LS Manifolds"
brand: "fast"
price: "$750.44"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/6402310-fast-54103-big-mouth-102mm-throttle-body-w-tps-iac
store_origin: US
region: United States of America
---

# 102mm enlarged throttle opening increased throttle blade thickness dual throttle spring mechanism FAST 54103 Big Mouth 102mm Throttle Body w/TPS & IAC Sensors - FAST LS Manifolds

**Brand:** fast
**Price:** $750.44
**Availability:** ✅ In Stock

## Summary

> 💥 Unleash your engine’s full potential with the FAST Big Mouth 102mm throttle body!

## Quick Answers

- **What is this?** FAST 54103 Big Mouth 102mm Throttle Body w/TPS & IAC Sensors - FAST LS Manifolds by fast
- **How much does it cost?** $750.44 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/6402310-fast-54103-big-mouth-102mm-throttle-body-w-tps-iac)

## 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

- • **Durability Under Pressure:** Thicker throttle blades eliminate deflection, perfect for boosted setups.
- • **Precision Throttle Control:** Dual spring linkage ensures razor-sharp throttle response and total control.
- • **Maximized Airflow Efficiency:** Innovative design and enlarged opening boost engine breathing for peak performance.
- • **Smooth & Responsive Operation:** Offset blade pivot reduces turbulence for seamless part-throttle drivability.
- • **Optimized for FAST LSXR Manifolds:** Engineered specifically to complement FAST LSXR intake manifolds for unmatched synergy.

## Overview

The FAST 54103 Big Mouth 102mm Throttle Body is a precision-engineered performance upgrade designed for FAST LSXR intake manifolds. Featuring an enlarged throttle opening, thicker blades to prevent deflection, and a dual spring mechanism for superior throttle control, it optimizes airflow and throttle response while maintaining smooth drivability. Ideal for high-performance and boosted engines, this throttle body delivers reliable, race-ready performance with advanced airflow dynamics and durable construction.

## Description

When it comes to improving your engine's performance, increased airflow is a key ingredient. The Fast Big Mouth Throttle Bodies for the Fast LSXR and the LSXRT 102 millimeter Intake Manifolds increase airflow through a series of innovative design changes and a slightly enlarged throttle opening. Fast also invested significant testing and engineering resources into optimizing cross-sectional flow and eliminating airflow turbulence, especially at part throttle operation. In addition, these throttle bodies offer increased throttle blade thickness to eliminate deflection commonly found with other throttle bodies, especially those in boosted applications. A smoother operating offset blade pivot improves throttle response, and a beefed up linkage and dual throttle spring mechanism ensure total throttle control. Big Mouth 102 millimeter Throttle Bodies also feature CFD optimized convolute bores to maintain low speed drivability.

## Features

- Designed to work with Fast LSXR intake manifolds
- Increases airflow via a series of innovative design changes and an enlarged opening
- Increased throttle blade thickness to eliminate deflection
- Smoother operating offset blade pivot improves throttle response
- Beefed up linkage and dual throttle spring mechanism ensure total throttle control

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Operation Mode | manual |
| Contact Type | Normally Open |
| Connector Type | Screw |
| Brand | FAST |
| Terminal | Screw |
| Item dimensions L x W x H | 13.3 x 10.8 x 5.2 inches |
| Circuit Type | 1-way |
| Actuator Type | Hinge Lever |
| Contact Material | Copper |
| International Protection Rating | IP44 |
| Control Method | App |
| Connectivity Protocol | X-10 |
| Color | Silver |
| Unit Count | 1.0 Count |
| Number of Items | 1 |
| Global Trade Identification Number | 00036584208136 |
| Manufacturer | FAST |
| Vehicle Service Type | High-Performance Vehicles |
| Control Type | Manual |
| Compatible Devices | FAST LSXR intake manifolds, FAST brand devices |
| UPC | 036584208136 |
| Model | FAST - Throttle Body LSX 102MM W/TPS (54103) |
| Item Weight | 3.96 pounds |
| Product Dimensions | 13.3 x 10.8 x 5.2 inches |
| Item model number | FST54103 |
| Exterior | Machined |
| Manufacturer Part Number | 54103 |
| OEM Part Number | 54103 |

## Product Details

- **Operation Mode:** manual
- **Contact Type:** Normally Open
- **Connector Type:** Screw
- **Brand:** FAST
- **Terminal:** Screw
- **Item dimensions L x W x H:** 13.3 x 10.8 x 5.2 inches
- **Circuit Type:** 1-way
- **Actuator Type:** Hinge Lever
- **Contact Material:** Copper
- **International Protection Rating:** IP44

## Images

![FAST 54103 Big Mouth 102mm Throttle Body w/TPS & IAC Sensors - FAST LS Manifolds - Image 1](https://m.media-amazon.com/images/I/61NKjcGu0eL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Big and beautiful
*by M***. on May 14, 2025*

I had to send back, my fault for not doing research, was wrong one. I will say taking it out of box the craftsmanship is top. It's definitely sexy. Shipping was crazy fast with no issues. Highly recommend.

### ⭐⭐⭐⭐⭐ Awesome
*by R***R on February 22, 2023*

Very fast shipping looks great A+++

### ⭐⭐⭐⭐⭐ 102 fast big month thottle body
*by B***Y on September 7, 2020*

great , and worked right out off the box , looks great and looks great with the 102 fast intake.

## Frequently Bought Together

- FAST 54103 Big Mouth 102mm Throttle Body w/TPS & IAC Sensors - FAST LS Manifolds
- FAST LSXr 102mm Intake Manifold for LS1, LS2, and LS6 (146302B), black
- COMP Cams O-Ring

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-25*