MagnaFlow

2011–2025 Subaru Forester / Subaru Outback 2.5L

Part #: 14377

Overview

The MagnaFlow 4x9in Oval 2.5in Offset Same Side Straight-Through Performance Exhaust Muffler 14377 is designed to enhance your vehicle's exhaust system with a combination of signature sound and proven performance. Crafted for enthusiasts seeking a balance of aggressive tone, improved flow, and durability, this muffler is an excellent upgrade for daily drivers and spirited enthusiasts alike. Its innovative design helps support increased horsepower and torque, while delivering a refined, deep exhaust note that elevates your driving experience.

Whether you're looking to improve your vehicle's sound profile or optimize exhaust flow for better performance, the MagnaFlow 14377 muffler provides a direct bolt-on solution that combines quality craftsmanship with functional benefits. Its sleek oval shape and stainless steel construction ensure longevity and a premium appearance, making it a perfect addition to your Subaru's exhaust system.

Key Features

The MagnaFlow 14377 features advanced engineering and high-quality materials to deliver optimal performance and durability. Key features include:

• Constructed with a perforated stainless steel core wrapped in acoustic fiber fill, providing a free-flowing, straight-through design that maximizes exhaust efficiency.
• Premium brushed stainless steel finish offers an elevated aesthetic that resists corrosion and maintains its appearance over time.
• Reversible 2.5/2.5-inch inlet and outlet layout allows flexible installation options to suit various vehicle configurations.
• Oval-shaped body measuring 4x9 inches, designed to fit seamlessly into the factory or aftermarket exhaust systems for a clean, integrated look.
• Weight-optimized design reduces overall vehicle weight, contributing to improved handling and performance.
• Engineered for a deep, aggressive exhaust tone that enhances your vehicle's sound without excessive drone or noise pollution.
• Dyno-proven to improve exhaust flow, supporting increased horsepower and torque for a more spirited driving experience.
• Manufactured with precision TIG welding and mandrel bends to ensure durability, optimal fitment, and consistent performance.
• Designed for easy bolt-on installation with no cutting or welding required, making it suitable for DIY enthusiasts and professional installers alike.

Construction & Design

The MagnaFlow 14377 muffler is built with a focus on durability and performance. Its stainless steel perforated core is engineered to withstand high temperatures and resist corrosion, ensuring long-lasting performance even under demanding conditions. The oval-shaped body is crafted from high-quality brushed stainless steel, providing a sleek appearance that complements any vehicle's aesthetic. The muffler's straight-through perforated core design promotes minimal backpressure, allowing exhaust gases to flow freely and support engine efficiency.

Manufactured with TIG welding and mandrel-bent tubing, the muffler maintains structural integrity and precise fitment. Its weight-optimized construction reduces unnecessary mass, contributing to improved handling and responsiveness. The reversible inlet/outlet configuration offers installation flexibility, accommodating various exhaust setups without the need for additional modifications.

Installation & Fitment

The MagnaFlow 14377 muffler is designed for a straightforward bolt-on installation. It utilizes the factory or aftermarket exhaust mounting points, with a reversible 2.5/2.5-inch inlet and outlet configuration that simplifies fitting into a variety of Subaru models. No cutting, welding, or complex modifications are required, making it an ideal upgrade for DIY enthusiasts and professional installers alike. The precision TIG-welded construction ensures a secure, leak-free fit and long-lasting performance.

• Easy bolt-on installation with standard tools
• No cutting, drilling, or tuning necessary
• Compatible with factory exhaust systems or aftermarket setups

What's Included

• MagnaFlow 4x9in Oval Straight-Through Performance Muffler 14377
• All necessary clamps and hardware for installation
• Installation instructions

Ideal For

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