What is the primary benefit of the SILENT Hi-Power exhaust system?

The primary benefit is an improved, sportier exhaust note compared to the stock system, achieved while minimizing excessive noise and drone. This makes it suitable for daily driving where a loud exhaust might be undesirable.

What material is the HKS SILENT Hi-Power exhaust made from?

This exhaust system is constructed from SUS304 stainless steel. This material is chosen for its strength and excellent resistance to corrosion, ensuring longevity and durability.

Does this exhaust system come with all the necessary hardware for installation?

Typically, cat-back exhaust systems are designed to utilize most of the factory hardware. While this system is designed for a direct fit, it's always recommended to consult the manufacturer's installation instructions to confirm if any specific new hardware is included or required.

HKS SILENT Hi-Power Cat-Back Exhaust 31019-AF023

Name: HKS SILENT Hi-Power GDB/GDA/GGA EJ20 Turbo
Brand: HKS
SKU: hks-hks-silent-hi-power-gdb-gda-gga-ej20-turbo-t14-113249
Price: 1312.00 USD
Availability: BackOrder

HKS SILENT Hi-Power GDB/GDA/GGA EJ20 Turbo

$1312.00

On Backorder — Expected to ship by Jun 19, 2026

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

HKS SILENT Hi-Power cat-back exhaust for Subaru Impreza WRX/STI GDB/GDA/GGA EJ20 Turbo.

Key Features

Fits Subaru Impreza WRX/STI GDB, GDA, and GGA chassis with EJ20 Turbo engines.
Constructed from durable SUS304 stainless steel for strength and corrosion resistance.
Designed to provide an improved exhaust note while minimizing unwanted drone.
Cat-back system replaces factory exhaust from the catalytic converter rearward.
Large-diameter piping and specially designed muffler for optimized flow and sound.

This cat-back exhaust system is designed for the Subaru Impreza WRX/STI models with the GDB, GDA, or GGA chassis and the EJ20 Turbo engine. Please verify fitment for your specific vehicle configuration.

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Product Details

This HKS SILENT Hi-Power cat-back exhaust system is specifically made for the Subaru Impreza WRX/STI models with the GDB, GDA, or GGA chassis and the EJ20 Turbo engine. It's designed to replace the factory exhaust from the catalytic converter back, offering an improved exhaust note and potentially better flow without being overly loud for daily driving.

HKS is well-known for its performance exhaust systems, and the SILENT Hi-Power line aims to balance performance with a more refined sound. The system is constructed from SUS304 stainless steel, which is strong and resists corrosion, ensuring it holds up well over time. The large-diameter piping and the specially designed muffler help to reduce drone and keep the sound level manageable, even with the turbo engine. This makes it a solid option if you want a sportier sound than stock but don't want the noise that can come with some other aftermarket exhausts. Installation typically involves unbolting the stock system and bolting this one in its place, though some minor adjustments might be needed for perfect alignment.

When installing a cat-back system like this, it's a good idea to have a helper and ensure you have the necessary tools for unbolting the old exhaust and securing the new one. While this system is designed for a direct fit, checking the alignment before fully tightening all the clamps and hangers is always recommended. You'll likely notice a more responsive feel from the engine, especially at higher RPMs, and a deeper, more satisfying exhaust tone under acceleration.