What is the primary benefit of the titanium construction?

The primary benefit of the titanium construction is its exceptionally low weight. This exhaust system weighs only 10.4 kg (22.9 lbs), which helps reduce the overall mass of your vehicle, potentially improving performance and handling.

What is the difference between this SPEC-L2 model and other HKS Hi-Power exhausts?

The SPEC-L2 designation indicates a focus on lightweight construction using titanium and specific piping and muffler dimensions (75mm piping, 54x35mm oval muffler) optimized for a deeper sound and improved exhaust flow on certain Subaru models.

Does this cat-back exhaust system include everything needed for installation?

This cat-back system is designed to bolt directly onto the factory exhaust mounting points. While it typically includes necessary hardware for the exhaust sections themselves, it's always best to consult the manufacturer's installation guide for a complete list of included components and any additional items that may be recommended.

HKS Hi-Power SPEC-L2 Cat-Back Exhaust 31019-AF127

Name: HKS Hi-Power SPEC-L2 GRB/GRF EJ20
Brand: HKS
Price: 1889.28 USD
Availability: InStock

HKS Hi-Power SPEC-L2 GRB/GRF EJ20

$1889.28

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

HKS Hi-Power SPEC-L2 GRB/GRF EJ20 cat-back exhaust.

Key Features

Fits GRB/GRF chassis with EJ20 engine.
Constructed from lightweight titanium for reduced vehicle weight.
Weighs only 10.4 kg (22.9 lbs), significantly less than stock.
Features 75mm diameter piping.
Includes a 54mm x 35mm oval-shaped muffler.
Designed to provide a deeper exhaust note and improved flow.

Secure CheckoutFast Shipping631-982-0042

Product Details

The HKS Hi-Power SPEC-L2 cat-back exhaust system is constructed from lightweight, high-strength titanium, weighing in at just 10.4 kg (22.9 lbs). This significant weight reduction compared to stock systems helps improve your vehicle's overall performance by decreasing rotational mass. Designed specifically for the GRB/GRF chassis with the EJ20 engine, this system aims to provide a deeper, more aggressive exhaust note while improving exhaust flow.

The SPEC-L2 features a 75mm diameter piping and a 54mm x 35mm oval-shaped muffler. This specific sizing is chosen to balance exhaust gas velocity for optimal performance across the RPM range, preventing the loss of low-end torque often associated with larger diameter pipes. The titanium construction not only sheds weight but also offers excellent resistance to corrosion, ensuring longevity even in harsh conditions. The system is designed to bolt directly onto the factory exhaust mounting points, simplifying installation.

This cat-back system replaces the factory exhaust from the catalytic converter back. It's a popular choice for Subaru WRX STI owners looking for a noticeable improvement in sound and a substantial reduction in weight. While it enhances the exhaust note, it's engineered to remain within reasonable sound levels for street use. Installation typically involves unbolting the stock system and bolting in the new HKS components, though referring to the manufacturer's instructions is always recommended for specific details.