Magnaflow Performance Muffler

2011–2025 Universal Fitment / Performance Exhaust System

Part #: 12255

Overview

The MagnaFlow 5x18x8-inch Oval Performance Exhaust Muffler (12255) is designed to elevate your vehicle's exhaust sound and performance. Crafted with precision engineering, this muffler delivers a deep, aggressive exhaust note that enthusiasts crave, while also supporting improved exhaust flow for enhanced horsepower and torque. Whether you're looking to add a sporty tone to your daily driver or seeking performance gains for spirited driving, this muffler is an excellent choice.

Built for performance enthusiasts who demand quality and durability, the MagnaFlow muffler is suitable for a wide range of vehicles and applications. Its universal design allows for flexible installation, making it a versatile upgrade for many makes and models. Experience a noticeable improvement in exhaust sound and flow, helping your vehicle perform at its best on the street or track.

Key Features

The MagnaFlow 12255 muffler incorporates several advanced features to ensure optimal performance and longevity:

• Constructed with a free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill for durability and sound quality.
• Reversible, universal inlet/outlet configuration with 2.25-inch diameter on both sides, allowing flexible installation in various orientations and setups.
• Engineered to produce a signature MagnaFlow exhaust tone that balances aggressive sound with refined quality.
• High-quality stainless steel construction resists corrosion and withstands harsh driving conditions, ensuring long-lasting performance.
• Designed to improve exhaust flow compared to factory mufflers, supporting increased horsepower and torque.
• Mandrel-bent internal components promote smooth exhaust flow, reducing backpressure and enhancing engine efficiency.
• Easy bolt-on installation with minimal modifications required, making it suitable for DIY enthusiasts and professional installers alike.
• Compatible with a wide range of vehicles, thanks to its universal design and flexible inlet/outlet configuration.

Construction & Design

The MagnaFlow 12255 muffler features a robust stainless steel oval body measuring 5 inches by 18 inches, with an 8-inch length that fits a variety of exhaust setups. Its straight-through perforated core design ensures minimal flow restriction, maximizing exhaust efficiency and sound quality. The stainless steel mesh and acoustic fiber fill work together to dampen unwanted noise while amplifying the signature MagnaFlow tone.

The reversible inlet/outlet configuration provides installation flexibility, allowing you to orient the muffler in the most convenient or performance-oriented manner. The high-grade stainless steel construction not only enhances durability but also maintains a clean appearance over time, resisting rust and corrosion even in challenging environments. The internal mandrel bends promote consistent flow paths, reducing turbulence and backpressure, which can translate into better throttle response and overall engine performance.

Installation & Fitment

The MagnaFlow 12255 muffler is designed for straightforward bolt-on installation. Its universal inlet and outlet diameters of 2.25 inches allow it to fit a wide range of exhaust systems with minimal modifications. The reversible design offers additional flexibility in positioning, making it easier to adapt to your vehicle's specific configuration. No cutting, drilling, or tuning is typically required, and the muffler can be installed using standard hand tools and clamps.

• Reversible, universal 2.25-inch inlet/outlet configuration for flexible installation
• Simple bolt-on design compatible with many vehicles and exhaust setups
• No cutting, drilling, or tuning required in most applications

What's Included

• MagnaFlow 5x18x8-inch Oval Performance Muffler (12255)
• All necessary clamps and hardware for installation
• Installation instructions

Ideal For

• Performance enthusiasts seeking improved exhaust sound and flow
• Daily drivers looking for a durable, long-lasting muffler upgrade
• Car enthusiasts wanting a deep, aggressive exhaust tone
• Anyone aiming to support increased horsepower and torque with a quality aftermarket component