HKS Silent Hi-Power Cat-Back Exhaust System - Subaru Legacy B4 BL5 EJ20 Turbo (2003-2009)

Name: Legacy B4 03-09 EJ20 Turbo HKS Silent Hi-Power Catback
Brand: HKS
SKU: 31019-AF021
Price: 2879 EUR
Availability: InStock

The HKS Silent Hi-Power Cat-Back Exhaust System is designed for the Subaru Legacy B4 BL5 equipped with the turbocharged EJ20 engine. It combines enhanced performance with a refined exhaust note, delivering improved exhaust flow, faster turbo response, and excellent everyday driving comfort. It is an ideal upgrade for both daily-driven vehicles and performance-oriented street builds.

The straight-through design reduces back pressure and improves exhaust flow, allowing the engine to breathe more efficiently. This results in improved throttle response, more efficient cylinder scavenging, and a broader, more usable powerband while enabling the turbocharger to operate more efficiently throughout the rev range.

The Silent Hi-Power series incorporates HKS Silent Hi-Power technology, which minimizes low-frequency cabin noise and unwanted resonance without compromising performance. The result is a deep, sporty exhaust note with excellent comfort during both everyday commuting and longer journeys.

Manufactured from SUS304 stainless steel, the exhaust system offers outstanding heat resistance, excellent corrosion resistance, and long-lasting durability. It is JASMA-approved, ensuring compliance with Japanese noise regulations, and is designed as a direct replacement for the factory exhaust system with OEM-style fitment for straightforward installation.

Features

Fits the Subaru Legacy B4 BL5 (2003–2009) with the turbocharged EJ20 engine.
Complete Silent Hi-Power cat-back exhaust system.
Manufactured from SUS304 stainless steel.
Straight-through design with reduced back pressure.
Improved exhaust flow and faster turbo response.
Improved throttle response, more efficient cylinder scavenging, and a broader, more usable powerband.
HKS Silent Hi-Power technology reduces cabin noise and unwanted resonance.
Deep, sporty exhaust note with excellent everyday driving comfort.
JASMA-approved.
Direct replacement with OEM-style fitment.

Product video

Technical specification

Article nr:

31019-AF021

Manufacture Partnumber:

31019-AF021

In October 1973, two talented and young engineers had a vision; to design and build high performance engines and components that major OE manufacturers could not, or would not, produce. HKS pioneered the Japanese aftermarket industry by delivering a host of exciting new products, including the first commercially available electronic turbo timer and boost controller. Other early products included piggy-back ECUs and sophisticated fuel management tools. HKS was clearly driving performance trends for Japanese vehicles forward!

Today, HKS is one of the world's most well-known brands and the obvious choice for you who builds a JDM car. In the assortment you will find everything from chassis products to exhaust systems and turbo kits. HKS is behind some of the coolest builds and professional drivers in the world, so when you choose HKS, you choose the best.