HKS Legamax Premium Axle Back Exhaust

2011–2014 Subaru WRX STI Sedan 2.5L

Part #: 31021-AF021

Overview

The HKS Legamax Premium Axle Back Exhaust for the Subaru WRX STI Sedan (2011-2014) is designed to enhance both the sound and performance of your vehicle. Crafted for enthusiasts who seek a sporty yet refined exhaust note, this system offers a perfect balance between aggressive sound and daily drivability. Whether you're looking to improve exhaust flow, support increased horsepower, or simply enjoy a more engaging driving experience, the Legamax Premium exhaust delivers on all fronts.

Built with quality and precision, this axle back exhaust replaces the factory muffler to provide a noticeable upgrade in sound and performance. Its unique design ensures that your WRX STI maintains a quiet interior while delivering a sporty, aggressive tone when you accelerate. Ideal for street-driven enthusiasts who want a refined exhaust note without excessive drone or noise inside the cabin, the HKS Legamax Premium is a popular choice for those looking to elevate their vehicle's character.

Key Features

The HKS Legamax Premium Axle Back Exhaust features advanced engineering and high-quality materials to maximize your vehicle's potential. Key features include:

• High-grade stainless steel construction ensures durability and resistance to corrosion, maintaining its appearance and performance over time.
• 90mm burnt quad tips provide a bold, aggressive look and a deep, sporty exhaust note that enhances your WRX STI's character.
• 60mm piping diameter optimizes exhaust flow, reducing backpressure and supporting improved throttle response and power output.
• Straight, non-throttling design minimizes exhaust pressure, helping to support increased horsepower and torque.
• Quiet operation at idle and low RPMs, with a sporty sound that becomes more pronounced under acceleration, thanks to the carefully tuned muffler chamber.
• Gaskets and hardware included for a straightforward, bolt-on installation process.
• Designed specifically for the Subaru WRX STI Sedan (2011-2014), ensuring a perfect fit and seamless integration with factory components.

Construction & Design

The HKS Legamax Premium exhaust system is meticulously crafted from high-quality stainless steel, ensuring longevity and resistance to the harsh conditions of daily driving and spirited use. The muffler features a straight, free-flowing design that reduces exhaust backpressure, which can help improve overall engine efficiency and power delivery. The burnt quad tips not only add a striking visual appeal but also help dissipate heat effectively, maintaining their finish over time.

The system's design emphasizes a balance between performance and sound. The muffler chamber is engineered to produce a sporty, deep exhaust tone without excessive drone or interior noise, making it suitable for daily driving while still providing an engaging auditory experience. The use of high-quality gaskets and hardware ensures a secure fit and reliable performance for years to come.

Installation & Fitment

This axle back exhaust is designed as a bolt-on upgrade, requiring no cutting or welding. It mounts directly to the factory exhaust system using included gaskets and hardware, making installation straightforward for those with basic mechanical skills. No special tuning or modifications are necessary, and the system is engineered to fit seamlessly with the factory mounting points, ensuring a secure and professional-looking installation.

• Easy, bolt-on installation with standard hand tools
• No cutting, drilling, or tuning required
• Seamless fitment for the 2011-2014 Subaru WRX STI Sedan

What's Included

• HKS Legamax Premium Axle Back Exhaust muffler
• Burnt quad tips
• Gaskets and hardware for installation

Ideal For

• Subaru WRX STI owners seeking a sporty sound and improved exhaust flow
• Enthusiasts wanting a high-quality, durable exhaust upgrade
• Drivers looking for a refined yet aggressive exhaust note for daily driving and spirited runs