MagnaFlow Exhaust Muffler

2011–2025 Universal / Performance Exhaust System

Part #: 12398

Overview

The MagnaFlow 5x24x8in. Oval 3in. Center/Dual Straight-Through Performance Exhaust Muffler is designed to elevate your vehicle's exhaust system with a combination of signature sound and proven performance. Crafted for automotive enthusiasts who seek a deep, aggressive exhaust note along with increased flow efficiency, this muffler is a versatile upgrade suitable for a wide range of vehicles. Whether you're looking to enhance your daily driver or boost your performance setup, this muffler delivers a balanced blend of sound, durability, and performance.

Engineered with precision, the MagnaFlow muffler helps support improved exhaust flow, which can contribute to increased horsepower and torque. Its straight-through perforated stainless steel core ensures minimal backpressure, allowing your engine to breathe more freely. The result is a more responsive throttle, a richer exhaust tone, and potential gains in overall engine efficiency. Designed for ease of installation, this muffler is an excellent choice for those wanting a straightforward upgrade that combines quality craftsmanship with performance benefits.

Key Features

The MagnaFlow 12398 features several innovative design elements that set it apart from standard mufflers:

• Constructed with a free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill, providing durability and optimal sound quality.
• Oval shape measuring 5 inches by 8 inches, offering a sleek, performance-oriented appearance that complements many vehicle styles.
• Universal 3-inch inlet and outlet diameters with a reversible design, allowing flexible installation options and orientation to suit your vehicle's configuration.
• High-quality stainless steel construction resists corrosion and withstands harsh driving conditions, ensuring long-lasting performance.
• Designed to produce a signature MagnaFlow exhaust tone—deep, aggressive, yet refined—enhancing your vehicle's auditory presence.
• Optimized for improved exhaust flow, which can support increased horsepower and torque compared to stock mufflers.
• Easy to install with common tools, compatible with a variety of vehicle setups without requiring modifications.

Construction & Design

The MagnaFlow 12398 is built with premium stainless steel materials, ensuring exceptional durability and resistance to corrosion. Its oval shape not only provides a distinctive aesthetic but also helps optimize exhaust flow and sound characteristics. The straight-through perforated core design minimizes backpressure, promoting better engine breathing and performance. The inclusion of acoustic fiber fill helps dampen unwanted drone and noise, delivering a balanced sound profile that is both aggressive and refined. The reversible inlet/outlet configuration offers installation flexibility, making it suitable for various vehicle layouts and custom exhaust setups.

Installation & Fitment

The MagnaFlow 12398 is designed as a universal performance muffler, making it a straightforward bolt-on upgrade for many vehicles. Its reversible inlet/outlet configuration allows flexible installation orientation, accommodating various exhaust layouts. No cutting, drilling, or complex modifications are typically required, and it can be installed using standard exhaust tools. For optimal results, some trimming or custom fitting may be necessary depending on your specific vehicle setup. Always verify compatibility with your vehicle's exhaust system before installation.

• Reversible inlet/outlet design for flexible installation
• Compatible with most vehicles with a 3-inch exhaust inlet and outlet
• No cutting or welding required in most cases

What's Included

• MagnaFlow 5x24x8in. Oval Performance Exhaust Muffler
• Clamps and mounting hardware
• Installation instructions

Ideal For

• Performance enthusiasts seeking a deep, aggressive exhaust tone
• Drivers looking to improve exhaust flow and engine response
• Anyone upgrading their vehicle's exhaust system for enhanced sound and style