MagnaFlow Exhaust Muffler

2011–2025 Universal Fitment for Cars and Trucks

Part #: 11259

Overview

The MagnaFlow 4x18x9-inch Oval Straight-Through Performance Exhaust Muffler is designed to elevate your vehicle's exhaust system with a combination of aggressive sound and proven performance gains. Crafted for automotive enthusiasts seeking a deep, resonant exhaust note and improved flow, this muffler is a versatile upgrade suitable for a wide range of applications. Whether you're looking to enhance your daily driver or boost your vehicle's sound profile for spirited driving, this muffler delivers a balanced blend of durability, performance, and sound quality.

Built with high-quality materials and engineered for easy installation, the MagnaFlow muffler helps support increased horsepower and torque while maintaining a refined, aggressive exhaust tone. Its universal design makes it compatible with various vehicle makes and models, providing a straightforward upgrade for those who want to improve their vehicle's exhaust flow and sound characteristics.

Key Features

The MagnaFlow 11259 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, this muffler maximizes exhaust flow while dampening unwanted noise.
• The oval shape and 4x18x9-inch dimensions provide a sleek, performance-oriented aesthetic that complements a variety of vehicle styles.
• The reversible, universal 3/3-inch inlet/outlet configuration offers flexible installation options, allowing you to orient the muffler in the most suitable manner for your vehicle's exhaust layout.
• Made from durable stainless steel, this muffler resists corrosion and withstands harsh driving conditions, ensuring long-lasting performance and reliability.
• The straight-through design promotes improved exhaust scavenging, which can help support increased horsepower and torque compared to factory mufflers.
• Engineered to produce a signature MagnaFlow exhaust sound—deep, aggressive, yet refined—enhancing your vehicle's auditory presence on the road.
• Designed for easy bolt-on installation, compatible with existing exhaust systems without requiring extensive modifications.
• Ideal for enthusiasts who want a performance upgrade that combines sound, durability, and efficiency in a single component.

Construction & Design

The MagnaFlow 11259 is built with precision and quality craftsmanship. Its stainless steel construction ensures resistance to rust and corrosion, making it suitable for both street and off-road use. The oval shape not only provides a distinctive look but also allows for optimal fitment in various vehicle configurations. The straight-through perforated core is engineered for maximum flow, reducing backpressure and supporting performance gains. Acoustic fiber fill helps absorb unwanted drone and noise, resulting in a deep, throaty exhaust tone that enhances your driving experience.

The reversible inlet/outlet design adds versatility, enabling you to customize the installation orientation to best suit your vehicle's exhaust routing. Whether you need a center or offset inlet/outlet, this muffler adapts seamlessly, making it a flexible choice for a wide range of applications.

Installation & Fitment

The MagnaFlow 11259 is a bolt-on replacement designed for straightforward installation. Its universal inlet and outlet sizes allow it to fit a variety of exhaust configurations with minimal modifications. No cutting, welding, or extensive tuning is generally required, making it suitable for DIY enthusiasts and professional installers alike. It is recommended to verify compatibility with your specific vehicle before installation to ensure optimal fitment and performance.

• Easy bolt-on installation with standard tools
• No cutting, drilling, or tuning required in most applications
• Compatible with existing exhaust systems for a seamless upgrade

What's Included

• MagnaFlow 4x18x9-inch Oval Straight-Through Performance Exhaust Muffler
• All necessary clamps and hardware for installation
• Installation instructions

Ideal For

• Performance enthusiasts seeking a deep, aggressive exhaust tone
• Drivers looking to improve exhaust flow and support increased horsepower and torque
• Anyone upgrading their vehicle's exhaust system for better sound and durability