---
product_id: 7602092
title: "MagnaFlow Performance Exhaust Muffler 12258: 2.5\"/2.25\" Inlet/Outlet, 5x8x18\" Oval, Stainless Steel, Satin Finish"
brand: "magnaflow exhaust products"
price: "A$458"
currency: AUD
in_stock: true
reviews_count: 13
category: "Magna Flow Exhaust Products"
url: https://www.desertcart.com.au/products/7602092-magnaflow-performance-exhaust-muffler-12258-2-5-2-25-inlet
store_origin: AU
region: Australia
---

# Signature deep MagnaFlow sound Dyno-proven power boost Universal fit, satin stainless steel MagnaFlow Performance Exhaust Muffler 12258: 2.5"/2.25" Inlet/Outlet, 5x8x18" Oval, Stainless Steel, Satin Finish

**Brand:** magnaflow exhaust products
**Price:** A$458
**Availability:** ✅ In Stock

## Summary

> 🔥 Amplify your drive with the sound of power and precision!

## Quick Answers

- **What is this?** MagnaFlow Performance Exhaust Muffler 12258: 2.5"/2.25" Inlet/Outlet, 5x8x18" Oval, Stainless Steel, Satin Finish by magnaflow exhaust products
- **How much does it cost?** A$458 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/7602092-magnaflow-performance-exhaust-muffler-12258-2-5-2-25-inlet)

## Best For

- magnaflow exhaust products enthusiasts

## Why This Product

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

## Key Features

- • **Built to Endure:** Crafted from premium stainless steel with a satin finish, designed for durability and a sleek, professional look.
- • **Power Meets Precision:** Dyno-tested to optimize exhaust flow, boosting engine performance and giving your ride that extra edge.
- • **Confidence in Every Mile:** Backed by MagnaFlow’s limited lifetime construction warranty for worry-free, long-lasting performance.
- • **Unleash the Signature Roar:** Experience the iconic deep, resonating MagnaFlow exhaust tone that turns heads and commands respect.
- • **Custom Fit, Ultimate Flexibility:** Universal inlet/outlet sizing and oval design allow tailored installation to fit your vehicle’s unique specs.

## Overview

The MagnaFlow Performance Exhaust Muffler 12258 features a 5x8 inch oval stainless steel body with a straight-through perforated core and two-stage acoustic packing. Engineered for universal fitment with 2.5" inlet and 2.25" outlet, it delivers the signature deep MagnaFlow sound while enhancing engine power through optimized exhaust flow. Finished in satin stainless steel and backed by a limited lifetime warranty, this muffler is a durable, high-performance upgrade for cars and trucks.

## Description

The MagnaFlow 5" X 8" Oval Straight-Through Performance Muffler is engineered to enhance your ride with a healthy helping of our signature exhaust sound and dyno-proven performance thanks to its free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill.

Review: This is a great muffler that is made out of really nice stainless ... - I installed this muffler on my 1996 Chevy Silverado and it fit well (with some slight modification). This is a great muffler that is made out of really nice stainless steel and will last a really long time. The sound is perfect, not too loud but not too quiet either but it hasn’t fully broken in yet so it will get a little louder than it is right now but it’s not a loud muffler anyway. I installed my magnaflow muffler right in place of the stock one and got an extension to connect from the muffler to the tailpipe so I have all stock pipe. It sounds really good so far and once it’s broken in it’s gonna sound even better. I’ll include a video of how it sounds on my 5.7l vortec 350 in my truck.
Review: Magnaflow great quality and no interior drone! - Replaced FlowFx muffler case cracked after 2 months of use. Order the Magnaflow same size as other muffler. Bought some band clamps too no exhaust leaks and nice sound at start up, chill driving down the road sound. Nice aggressive sound at wide open throttle. Great replacement for anyone who doesn't want drone or too loud of an exhaust system. Running 2.5 inlet dual 2.5 outlets on 2022 Tacoma truck

## Features

- SIGNATURE MAGNAFLOW SOUND - The 5" x 8" Oval body of muffler 12258 is engineered to deliver the deep, resonating sound that MagnaFlow mufflers are famous for.
- DYNO-PROVEN PERFORMANCE - Extensive dyno testing is used to ensure that this 5" x 8" Oval muffler increases engine power and performance by improving the flow dynamics and evacuation of exhaust gases.
- OPTIMAL ARCHITECTURE & CONSTRUCTION - The internal architecture of this muffler features a straight-through perforated core with two-stage acoustic packing which maintains the velocity of exhaust flow while generating a smooth, deep exhaust tone. Proudly made in the USA.
- UNIVERSAL FITMENT - 12258’s universal design enables custom muffler placement and orientation to meet the particular spacing and mechanical requirements of your vehicle. Professional installation is highly recommended.
- LIMITED LIFETIME CONSTRUCTION WARRANTY - Performance that lasts. Enjoy worry-free ownership knowing that you're backed by MagnaFlow’s limited lifetime construction warranty.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | MagnaFlow Exhaust Products |
| Vehicle Service Type | Car, Truck |
| Configuration | Center/Dual |
| Shape | Oval |
| Inlet Connection Size | 2.5 Inches |
| Outlet Connection Size | 2.25 Inches |
| UPC | 841380000910 |
| Manufacturer | MagnaFlow Exhaust Products |
| Global Trade Identification Number | 00841380000910 |
| OEM Part Number | 12258 |
| Automotive Fit Type | Vehicle Specific Fit |
| Model | Straight-Through |
| Item Weight | 10 pounds |
| Item model number | 12258 |
| Is Discontinued By Manufacturer | No |
| Exterior | Satin |
| Manufacturer Part Number | 12258 |

## Product Details

- **Brand:** MagnaFlow Exhaust Products
- **Material:** Stainless Steel
- **Vehicle Service Type:** Car, Truck
- **Item Weight:** 10 Pounds
- **Configuration:** Center/Dual

## Images

![MagnaFlow Performance Exhaust Muffler 12258: 2.5"/2.25" Inlet/Outlet, 5x8x18" Oval, Stainless Steel, Satin Finish - Image 1](https://m.media-amazon.com/images/I/51zplOBd+SL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ This is a great muffler that is made out of really nice stainless ...
*by A***. on January 29, 2018*

I installed this muffler on my 1996 Chevy Silverado and it fit well (with some slight modification). This is a great muffler that is made out of really nice stainless steel and will last a really long time. The sound is perfect, not too loud but not too quiet either but it hasn’t fully broken in yet so it will get a little louder than it is right now but it’s not a loud muffler anyway. I installed my magnaflow muffler right in place of the stock one and got an extension to connect from the muffler to the tailpipe so I have all stock pipe. It sounds really good so far and once it’s broken in it’s gonna sound even better. I’ll include a video of how it sounds on my 5.7l vortec 350 in my truck.

### ⭐⭐⭐⭐⭐ Magnaflow great quality and no interior drone!
*by R***S on January 2, 2023*

Replaced FlowFx muffler case cracked after 2 months of use. Order the Magnaflow same size as other muffler. Bought some band clamps too no exhaust leaks and nice sound at start up, chill driving down the road sound. Nice aggressive sound at wide open throttle. Great replacement for anyone who doesn't want drone or too loud of an exhaust system. Running 2.5 inlet dual 2.5 outlets on 2022 Tacoma truck

### ⭐⭐⭐⭐⭐ Installed on a 2016 Tundra 5.7L, Exactly what I wanted
*by E***7 on January 7, 2021*

I was looking for full, duel exhaust since I bought the truck in April. I wanted something to add little more low tone and just more lively then stock but didn't wanna be "that guy" waking the neighborhood up when you drive by or start it. I also didnt see a point in spending $1000+ for a full dual system when my current was doing the job. Middle ground is buying a muffler and putting it on the stock pipes, so I did that. Great sound especially at lower speeds, could be considered slight drone in certain gears and rpm but not bad. When stepping on it combined with the Specter Cold Air intake makes the truck sound come alive. I also seeing a +1mpg currently which is interesting. No torque loss (according to my butt dyno). One review hear says its the goldey locks of mufflers. It really is. Put on a nice looking tip and called it a day. Aftermarket sound and look for $290 with install and the tip.

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-23*