---
product_id: 1380213
title: "Flowmaster 815425S Outlaw Series Race Muffler"
brand: "flowmaster"
price: "¥61363"
currency: JPY
in_stock: true
reviews_count: 12
category: "Flowmaster"
url: https://www.desertcart.jp/products/1380213-flowmaster-815425s-outlaw-series-race-muffler
store_origin: JP
region: Japan
---

# Polished finish with embossed logo No internal packing - zero blowout risk Compact design - fits tight spaces Flowmaster 815425S Outlaw Series Race Muffler

**Brand:** flowmaster
**Price:** ¥61363
**Availability:** ✅ In Stock

## Summary

> 🔥 Dominate the streets with the Outlaw roar!

## Quick Answers

- **What is this?** Flowmaster 815425S Outlaw Series Race Muffler by flowmaster
- **How much does it cost?** ¥61363 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/1380213-flowmaster-815425s-outlaw-series-race-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:** No internal packing means no blowouts, ensuring durability under pressure
- • **Signature Style:** Polished exterior with embossed Flowmaster logo for that premium, head-turning look
- • **Sleek & Compact:** Designed to fit directly on header collectors or existing exhausts without bulk
- • **Proven Performance:** Loved by truck enthusiasts for deep, rumbling idle and insane throttle response
- • **Race-Ready Power Boost:** Unleash aggressive sound and performance with no decibel limits

## Overview

The Flowmaster 815425S Outlaw Series Race Muffler is a compact, durable exhaust component designed for racing applications without decibel restrictions. Featuring no internal packing to prevent blowouts, a polished finish, and an embossed logo, it delivers a deep, aggressive sound that enhances throttle response and fits seamlessly onto header collectors or existing exhaust systems.

## Description

Outlaw mufflers are designed to be connected directly to the header collectors or can be added into an existing exhaust system. Recommended for racing applications where a muffler is required without a set decibel limit to be met.

Review: Great option for 3.5 eco boost f150 - This thing sounds absolutely insane on my f150 3.5 eco boost. Muffler delete and replace with flow master then dual tips coming out in front of the back wheel. It sounds great, deep rumble for idle and when you step on it it's goes crazy.
Review: Amazing! - I have a 3 Gen Ram1500 5.7. Get this! It sounds so amazing on my truck especially when I give it throttle. You won’t be sorry

## Features

- No internal packing to blowout
- Compact Design
- Polished
- Embossed Flowmaster logo

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B008KWIFKW |
| Best Sellers Rank | #626,202 in Automotive ( See Top 100 in Automotive ) #190 in Automotive Performance Exhaust Mufflers #11,896 in Automotive Emission & Exhaust Products |
| Brand | Flowmaster |
| Customer Reviews | 4.5 4.5 out of 5 stars (106) |
| Date First Available | July 13, 2012 |
| Exterior | Painted |
| Global Trade Identification Number | 00700042027439 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 3.3 pounds |
| Item model number | 815425S |
| Manufacturer | Flowmaster |
| Manufacturer Part Number | 815425S |
| Model | 815425S |
| OEM Part Number | 815425S |
| Shape | Round |
| UPC | 700042027439 |
| Vehicle Service Type | Car |

## Product Details

- **Brand:** Flowmaster
- **Item Weight:** 3.3 Pounds
- **Material:** Stainless Steel
- **Shape:** Round
- **Vehicle Service Type:** Car

## Images

![Flowmaster 815425S Outlaw Series Race Muffler - Image 1](https://m.media-amazon.com/images/I/51PFJBJT3ZL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great option for 3.5 eco boost f150
*by D***L on November 17, 2025*

This thing sounds absolutely insane on my f150 3.5 eco boost. Muffler delete and replace with flow master then dual tips coming out in front of the back wheel. It sounds great, deep rumble for idle and when you step on it it's goes crazy.

### ⭐⭐⭐⭐⭐ Amazing!
*by C***O on January 24, 2025*

I have a 3 Gen Ram1500 5.7. Get this! It sounds so amazing on my truck especially when I give it throttle. You won’t be sorry

### ⭐⭐⭐⭐⭐ Great sound
*by J***. on February 21, 2025*

They really woke my 5.7 hemi up. Definitely would buy again

## Frequently Bought Together

- Flowmaster 815425S Outlaw Series Race Muffler
- Upower Pack of 2 Exhaust Tip 2.5 inch Inlet 4 inch Outlet 9" Long 304 Stainless Steel 2.5" to 4" Diesel Exhaust Tailpipe Tip Double Wall Slant Cut
- Flowmaster 815425 Outlaw Series Race Muffler

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**Shop now:** [https://www.desertcart.jp/products/1380213-flowmaster-815425s-outlaw-series-race-muffler](https://www.desertcart.jp/products/1380213-flowmaster-815425s-outlaw-series-race-muffler)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-09-24*