---
product_id: 390881608
title: "Flowmaster 425404 Exhaust Muffler"
brand: "flowmaster"
price: "£181.84"
currency: GBP
in_stock: true
reviews_count: 5
category: "Flowmaster"
url: https://www.desertcart.co.uk/products/390881608-flowmaster-425404-exhaust-muffler
store_origin: GB
region: United Kingdom
---

# Aggressive exterior & interior exhaust tone Universal fit for street, strip & off-road 16 gauge aluminized steel - rugged durability Flowmaster 425404 Exhaust Muffler

**Brand:** flowmaster
**Price:** £181.84
**Availability:** ✅ In Stock

## Summary

> 🔥 Unleash the roar that turns heads everywhere!

## Quick Answers

- **What is this?** Flowmaster 425404 Exhaust Muffler by flowmaster
- **How much does it cost?** £181.84 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/390881608-flowmaster-425404-exhaust-muffler)

## Best For

- flowmaster enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Fully welded 16 gauge aluminized steel ensures unmatched longevity and corrosion resistance.
- • **Versatile Fit:** Universal design fits a wide range of vehicles for street, strip, and off-road adventures.
- • **Lightweight Power:** At just 4.65 kg, it balances durability with minimal added weight for optimal handling.
- • **Precision Engineering:** MIG welded construction guarantees maximum strength and leak-free performance.
- • **Iconic Flowmaster Sound:** Delivers that unmistakable aggressive exterior roar and deep interior resonance.

## Overview

The Flowmaster 425404 Exhaust Muffler is a durable, fully welded 16 gauge aluminized steel muffler designed for universal fitment. It delivers the classic aggressive Flowmaster sound with both exterior and interior resonance, making it ideal for street, strip, and off-road use. Weighing only 4.65 kg, it combines rugged construction with lightweight performance.

## Description

The Original 40 series muffler delivers an aggressive exterior and interior tone. If you're looking for that original Flowmaster sound, this is the muffler for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.

Review: Nice deep rumble - Best bang “rumble” for the buck
Review: Great sound a more oower. I love it. - This muffler isbadass. It sounds awesome!

## Features

- Durable fully welded 16 gauge aluminized steel
- Aggressive sound exterior exhaust tone
- Noticeable interior resonance
- Excellent Street/Strip and Off Road application
- Fit type: Universal Fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01IDDG3V0 |
| Brand | Flowmaster |
| Brand Name | Flowmaster |
| Compatible with Vehicle Type | Car |
| Configuration | Dual/Dual |
| Customer Reviews | 4.7 out of 5 stars 121 Reviews |
| Global Trade Identification Number | 00700042026029 |
| Included Components | Muffler |
| Inlet Connection Size | 2.5 Millimeters |
| Item Dimensions | 52.1 x 25.4 x 11.4 centimeters |
| Item Type Name | Exhaust Muffler |
| Item Weight | 4.65 kg |
| Item dimensions L x W x H | 52.1 x 25.4 x 11.4 centimeters |
| Item weight | 4.65 kg |
| Manufacturer | Flowmaster |
| Manufacturer Part Number | 425404 |
| Material | Alloy Steel |
| Material Type | Alloy Steel |
| Model Number | 425404 |
| OEM Equivalent Part Number | 425404 |
| Outlet Connection Size | 2.5 Millimeters |
| Shape | Oval |
| UPC | 700042026029 |
| Unit Count | 1 Count |
| Vehicle service type | Car |

## Product Details

- **Brand:** Flowmaster
- **Item dimensions L x W x H:** 52.1 x 25.4 x 11.4 centimeters
- **Item weight:** 4.65 kg
- **Material:** Alloy Steel
- **Vehicle service type:** Car

## Images

![Flowmaster 425404 Exhaust Muffler - Image 1](https://m.media-amazon.com/images/I/71PeQy5X1iL.jpg)
![Flowmaster 425404 Exhaust Muffler - Image 2](https://m.media-amazon.com/images/I/71W8SizHYwL.jpg)
![Flowmaster 425404 Exhaust Muffler - Image 3](https://m.media-amazon.com/images/I/81in03ZdSxL.jpg)
![Flowmaster 425404 Exhaust Muffler - Image 4](https://m.media-amazon.com/images/I/81jBSKJtzRL.jpg)
![Flowmaster 425404 Exhaust Muffler - Image 5](https://m.media-amazon.com/images/I/81gHF3UO0zL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice deep rumble
*by A***M on 29 October 2020*

Best bang “rumble” for the buck

### ⭐⭐⭐⭐⭐ Great sound a more oower. I love it.
*by C***N on 26 November 2025*

This muffler isbadass. It sounds awesome!

### ⭐⭐⭐⭐⭐ Good volume
*by J***S on 17 October 2025*

Great muffler

## Frequently Bought Together

- Flowmaster 425404 40 Series Chambered Muffler
- EVIL ENERGY 2.5 Inch Exhaust Clamp,2 1/2" Butt Joint Band Clamp Sleeve Coupler Stainless Steel for Pipes,Mufflers,Catalytic Converters 1PCS
- EVIL ENERGY 2.5'' Exhaust Clamp,Lap Joint Band Clamp Stainless Steel for Pipes,Mufflers,Catalytic Converters (1, 2.5 inch)

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**Shop now:** [https://www.desertcart.co.uk/products/390881608-flowmaster-425404-exhaust-muffler](https://www.desertcart.co.uk/products/390881608-flowmaster-425404-exhaust-muffler)

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-06-10*