MagnaFlow Performance Exhaust Muffler

2011–2025 Subaru Forester / Subaru Impreza / Subaru WRX 1.75in Inlet/Outlet

Part #: 18113

Overview

The MagnaFlow 3.5in Round Glasspack Performance Exhaust Muffler 18113 is designed to elevate your vehicle's exhaust note while delivering improved flow and performance. Crafted for automotive enthusiasts who crave a deep, classic sound with a touch of vintage hot rod character, this muffler transforms your ride into a more spirited and engaging driving experience. Whether you're looking to enhance your daily driver or add a distinctive sound to your project car, this glasspack muffler offers a perfect blend of style and function.

Built with performance in mind, the MagnaFlow Glasspack Muffler is ideal for those seeking a bold exhaust tone and increased volume. Its lightweight construction ensures minimal added weight, making it suitable for a variety of applications without compromising vehicle dynamics. Designed for easy installation, this muffler fits seamlessly into your existing exhaust system, providing a straightforward upgrade that boosts both sound and performance.

Key Features

The MagnaFlow Glasspack Muffler is engineered with several key features that make it a standout choice for performance-minded drivers:

• Constructed with a free-flowing, reversible straight-through design that maximizes exhaust flow and enhances sound quality.
• Round muffler body with a 3.5-inch diameter provides a deep, resonant tone characteristic of classic hot rods and muscle cars.
• Single-stage packing with a satin finish offers durability and a sleek appearance, complementing any engine bay or undercarriage.
• Weight-optimized design reduces overall vehicle weight, contributing to improved handling and efficiency.
• Precision mandrel bends ensure smooth exhaust flow, minimizing turbulence and backpressure.
• Durable materials and craftsmanship ensure long-lasting performance and resistance to corrosion.
• Dyno-proven performance gains support increased horsepower and torque, especially when paired with other exhaust system upgrades.
• Designed to produce a rich, deep exhaust note that enhances driving enjoyment without excessive drone or noise pollution.

Construction & Design

The MagnaFlow 18113 muffler features a robust, stainless steel construction that guarantees longevity and resistance to the elements. Its round, glasspack-style design is a nod to traditional hot rod aesthetics, offering a vintage look with modern performance benefits. The straight-through, reversible core allows for flexible installation options and tuning preferences, enabling you to customize the exhaust tone to your liking. The satin finish not only adds a refined appearance but also helps resist discoloration and corrosion over time.

Designed with precision engineering, this muffler employs mandrel-bent tubing and TIG-welded seams to ensure optimal exhaust flow and structural integrity. Its lightweight profile makes it suitable for a wide range of vehicles, providing a significant performance upgrade without adding unnecessary weight. The overall design emphasizes durability, sound quality, and ease of installation, making it a popular choice among hot rod builders, muscle car enthusiasts, and daily drivers alike.

Installation & Fitment

This muffler is designed for straightforward bolt-on installation, fitting directly into your existing exhaust system with minimal modifications. Its 1.75-inch inlet and outlet diameters are compatible with many factory and aftermarket exhaust pipes. No cutting, drilling, or tuning is typically required, making it an accessible upgrade for DIY enthusiasts and professional installers alike. Ensure your vehicle's exhaust system matches the specified inlet/outlet size for optimal fitment.

• Easy bolt-on installation with standard tools
• Compatible with 2011–2025 Subaru Forester, Impreza, WRX, and similar models with 1.75-inch exhaust connections
• No cutting, drilling, or tuning necessary for most applications

What's Included

• Complete round glasspack performance muffler with 3.5-inch diameter
• All necessary clamps and hardware for installation
• Instruction manual for proper fitment and tips

Ideal For

• Performance enthusiasts seeking a deep, classic exhaust tone
• Owners looking to improve exhaust flow and support modest power gains
• Hot rod and muscle car builders aiming for vintage aesthetics with modern performance
• Daily drivers wanting a distinctive sound without sacrificing reliability