MagnaFlow Exhaust Muffler

2010–2025 Universal Fit for Cars and Trucks with 2.25" or 2.5" Exhaust Systems

Part #: 12258

Overview

The MagnaFlow 5x18x8in Oval Straight-Through Performance Exhaust Muffler 12258 is designed to elevate your vehicle's exhaust system with a combination of aggressive sound and improved flow. Crafted for enthusiasts seeking enhanced performance and a signature exhaust note, this muffler offers a versatile and durable solution for a wide range of vehicles. Whether you're upgrading your daily driver or building a performance-oriented setup, this muffler helps support increased horsepower and torque while delivering that deep, resonant exhaust tone you desire.

Engineered with precision and quality, the MagnaFlow 12258 muffler is ideal for those who want a straightforward, bolt-on upgrade that combines performance gains with a distinctive sound. Its universal design makes it suitable for various applications, providing flexibility for custom exhaust builds or replacements. With its free-flowing straight-through perforated stainless steel core wrapped in stainless steel mesh and acoustic fiber fill, this muffler ensures optimal exhaust flow and durability, making it a reliable choice for spirited driving and daily use alike.

Key Features

The MagnaFlow 12258 muffler incorporates several advanced features to enhance your vehicle's exhaust system:

• Constructed with a stainless steel perforated core wrapped in stainless steel mesh and acoustic fiber fill for durability and sound quality.
• Oval, straight-through design promotes unrestricted exhaust flow, helping to improve horsepower and torque.
• Reversible, universal inlet/outlet configuration with 2.5-inch and 2.25-inch diameters allows flexible installation in various setups.
• Signature MagnaFlow exhaust tone delivers a deep, aggressive sound that enhances your vehicle's character.
• Built with high-quality stainless steel to resist corrosion and withstand harsh driving conditions.
• Designed for easy bolt-on installation with minimal modifications required.
• Dyno-proven performance improvements, supporting your vehicle's power and efficiency upgrades.

Construction & Design

The MagnaFlow 12258 muffler features a robust stainless steel construction, ensuring long-lasting performance and resistance to rust and corrosion. Its oval, straight-through design maximizes exhaust flow, reducing backpressure and supporting engine efficiency. The perforated core is wrapped in stainless steel mesh and acoustic fiber fill, which not only enhances sound quality but also dampens unwanted noise for a refined exhaust note. The reversible inlet/outlet configuration provides installation flexibility, accommodating various exhaust layouts and vehicle configurations. Overall, the design emphasizes durability, performance, and a distinctive sound profile, making it a popular choice among performance enthusiasts and daily drivers alike.

Installation & Fitment

The MagnaFlow 12258 muffler is designed for straightforward bolt-on installation, compatible with vehicles that have 2.25-inch or 2.5-inch exhaust systems. Its universal inlet/outlet configuration allows for flexible mounting options, and the durable stainless steel construction ensures a secure fit. No cutting, drilling, or complex modifications are typically required, making it suitable for DIY enthusiasts and professional installers alike. Proper alignment and securing of clamps are recommended to ensure optimal performance and longevity.

• Reversible inlet/outlet for versatile installation options
• Compatible with 2.25" and 2.5" exhaust systems
• Simple bolt-on design with standard mounting hardware

What's Included

• MagnaFlow 5x18x8in Oval Straight-Through Performance Exhaust Muffler 12258
• All necessary clamps and hardware for installation
• Installation instructions

Ideal For

• Performance enthusiasts seeking improved exhaust flow and sound
• Daily drivers looking for a durable, high-quality muffler upgrade
• Custom exhaust builders requiring a versatile, universal muffler
• Anyone wanting a deep, aggressive exhaust tone with reliable stainless steel construction