HKS Hi-Power Spec-L II Cat-Back Exhaust System

2007–2014 Subaru WRX / STI 2.0L Turbo

Part #: 31019-AF127

Overview

The HKS Hi-Power Spec-L II Cat-Back Exhaust System is a high-performance upgrade designed specifically for Subaru WRX and STI models from 2007 to 2014. Crafted with racing enthusiasts in mind, this exhaust system enhances both the power output and the aggressive sound profile of your vehicle. Whether you're looking to improve your car's throttle response, increase horsepower, or simply enjoy a more spirited driving experience, this system offers a reliable and durable solution.

Made from premium materials and engineered with precision, the HKS Hi-Power Spec-L II provides a noticeable improvement over stock exhaust setups. Its aggressive tone and deep exhaust note make it a popular choice among enthusiasts seeking a race-inspired sound without sacrificing daily drivability. Designed for easy installation, this system is perfect for those who want to elevate their Subaru's performance and sound profile with a proven, race-developed exhaust solution.

Key Features

The HKS Hi-Power Spec-L II Cat-Back Exhaust System incorporates several advanced features that set it apart from standard exhausts:

• Constructed from high-grade SUS304 stainless steel, ensuring excellent corrosion resistance and longevity even under harsh conditions.
• Mandrel-bent main pipes with a diameter of 65mm tapering to 50.8mm, optimized for smooth airflow and reduced turbulence, which helps support increased horsepower and torque.
• Dual exhaust tips with a diameter of 94mm, providing a bold and aggressive aesthetic while enhancing exhaust flow.
• Designed with a straight-through, free-flowing layout that minimizes backpressure and maximizes exhaust efficiency.
• Professionally developed with a focus on performance, durability, and a deep, aggressive exhaust tone.
• Noise level of approximately 90dB at idle and 71dB at cruising, delivering a loud, sporty sound that turns heads without being overly intrusive.
• Compatible with the factory mounting points, ensuring a straightforward bolt-on installation process.
• Backed by HKS's reputation for quality and performance, making it a trusted upgrade for serious Subaru enthusiasts.

Construction & Design

The HKS Hi-Power Spec-L II exhaust system features a meticulously engineered design, utilizing high-quality SUS304 stainless steel for both the main pipes and tips. The mandrel-bent tubing ensures consistent diameter throughout the system, reducing flow restrictions and promoting optimal exhaust scavenging. The one-piece construction of the main pipe enhances durability and fitment precision, while TIG welding provides a clean, strong joint that withstands the rigors of spirited driving.

The dual 94mm tips not only add a commanding visual presence but also contribute to improved exhaust flow. The system's design emphasizes a balance between performance gains and a bold, aggressive sound, making it ideal for drivers seeking a race-inspired exhaust note that complements the vehicle's turbocharged engine.

Installation & Fitment

The HKS Hi-Power Spec-L II Cat-Back Exhaust System is a bolt-on upgrade that uses the vehicle's factory mounting points. No cutting, drilling, or complex modifications are required for installation. The system is designed for a straightforward, hassle-free process, allowing you to upgrade your exhaust in your own garage or workshop with basic tools. For optimal performance and sound, professional installation is recommended.

• Direct bolt-on installation using factory mounting points
• No cutting or welding required
• Compatible with 2007–2014 Subaru WRX and STI models with 2.0L turbocharged engines

What's Included

• Complete cat-back exhaust system with dual 94mm tips
• Mandrel-bent stainless steel piping
• All necessary clamps and hardware for installation
• Detailed installation instructions

Ideal For

This exhaust system is perfect for Subaru enthusiasts who want to enhance their vehicle's performance and sound. It is well-suited for daily drivers, weekend racers, and anyone seeking a race-inspired upgrade that combines durability, improved airflow, and an aggressive exhaust tone.