HKS Hi-Power Single Muffler – 2015 Subaru WRX / STi (VA) | US Specification | Single Exit

The HKS Hi-Power Single Muffler for the 2015 US-specification Subaru WRX and STi (VA chassis) is one of the most iconic exhaust upgrades available for the EJ/FA-powered WRX and STi — delivering HKS's legendary Hi-Power exhaust note in a direct-fit single exit muffler configuration engineered specifically for the 2015 US-market VA WRX and STi. HKS is one of the most respected and iconic Japanese performance brands in the world — a company with over 50 years of motorsport and performance development experience whose Hi-Power exhaust lineup has defined the sound of Japanese performance cars for decades. The HKS Hi-Power muffler is not just an exhaust upgrade — it is a piece of Japanese performance heritage.

Key Features:

• HKS Hi-Power exhaust note — HKS's legendary Hi-Power exhaust character — a deep, refined, distinctly Japanese performance exhaust note that has defined the sound of modified WRX and STi builds for decades
• Single exit configuration — single exit muffler tip — a clean, purposeful exhaust presentation that suits the VA WRX and STi's performance character
• US specification — engineered for the 2015 US-market Subaru WRX and STi — correct connection points and dimensions for the US-spec VA chassis exhaust system
• Direct-fit — engineered for direct-fit installation on the 2015 US-spec VA WRX and STi — correct flange dimensions and connection points for the factory exhaust mid-pipe
• HKS quality — manufactured by HKS, one of the most respected and iconic Japanese performance brands in the world — over 50 years of motorsport and performance development experience

HKS Hi-Power — The Legacy:

The HKS Hi-Power exhaust is one of the most iconic product lines in the Japanese performance aftermarket — a muffler design that has been a staple of the JDM tuning scene for decades. The Hi-Power's exhaust note is immediately recognizable — a deep, refined, distinctly Japanese performance sound that is neither obnoxiously loud nor disappointingly quiet. For WRX and STi owners who want the authentic HKS Hi-Power exhaust experience on their VA-chassis build, the HKS31006-BF003 is the correct, application-specific choice for the 2015 US-market WRX and STi.

VA WRX / STi — Platform Context:

The 2015 Subaru WRX and STi (VA chassis) represent the fourth generation of one of the most celebrated all-wheel-drive performance sedans in automotive history. The VA WRX uses the FA20DIT turbocharged 2.0L engine, while the VA STi retains the legendary EJ257 turbocharged 2.5L boxer — two engines with very different exhaust characters that both benefit from the HKS Hi-Power muffler's refined exhaust note. The US-specification VA WRX and STi have specific exhaust system dimensions that differ from JDM-specification vehicles — the HKS31006-BF003 is engineered specifically for the US-market configuration.

Specifications:

• Brand: HKS
• Part Number: HKS31006-BF003
• Barcode: 4957266941485
• Series: Hi-Power
• Configuration: Single exit muffler
• Specification: US market
• Application: 2015 Subaru WRX / WRX STi — VA chassis — US specification
• Weight: 40.6 lbs (shipping weight)

Fitment Information:

• 2015 Subaru WRX — VA chassis — FA20DIT — US specification
• 2015 Subaru WRX STi — VA chassis — EJ257 — US specification
• US specification — correct for US-market VA WRX and STi exhaust system dimensions
• Note: This listing is for the 2015 model year US-specification VA WRX and STi — verify your specific model year and market specification before ordering. The VA WRX and STi were produced from 2015–2021 — confirm that HKS31006-BF003 is the correct Hi-Power muffler for your specific year and specification. Professional installation recommended.

What's Included:

• HKS Hi-Power single muffler — 2015 Subaru WRX/STi VA US spec (HKS31006-BF003)
• All required hardware and gaskets for installation
• Refer to HKS's product documentation for complete kit contents

Installation Notes:

• Professional installation recommended — muffler installation requires correct torque at the mid-pipe connection and correct exhaust hanger alignment
• Allow the exhaust system to fully cool before installation — never work on a hot exhaust system
• Apply anti-seize compound to all exhaust fasteners — exhaust fasteners are subject to extreme heat cycling and will seize without anti-seize
• Verify correct exhaust hanger alignment after installation — the exhaust system must hang correctly without contacting the underbody, heat shields, or suspension components
• A break-in period is normal for a new exhaust system — some smoke and odour from manufacturing residue is expected on the first few heat cycles and will dissipate

Why HKS?

HKS is one of the most respected and iconic Japanese performance brands in the world — a company founded in 1973 with over 50 years of motorsport and performance development experience. HKS's product lineup spans turbochargers, exhaust systems, suspension, engine management, and performance accessories for a wide range of Japanese performance platforms. The HKS Hi-Power exhaust is one of HKS's most enduring and beloved product lines — a muffler design that has defined the sound of Japanese performance cars for decades. For WRX and STi owners who want the authentic HKS Hi-Power exhaust experience from one of the most iconic names in Japanese performance, HKS31006-BF003 is the correct choice.

Perfect For:

• 2015 Subaru WRX and STi (VA chassis, US specification) owners who want the authentic HKS Hi-Power exhaust note — a deep, refined, distinctly Japanese performance exhaust character from one of the most iconic exhaust brands in the JDM performance world
• VA WRX and STi builds where the HKS Hi-Power muffler's legendary exhaust note and HKS brand heritage are the correct choice for a premium exhaust upgrade
• Owners who want a direct-fit, application-specific exhaust upgrade from HKS — engineered specifically for the 2015 US-market VA WRX and STi

Note: 2015 US-specification VA WRX and STi only — verify model year and market specification before ordering. Apply anti-seize to all exhaust fasteners. Verify exhaust hanger alignment after installation. Break-in period normal on first heat cycles. Professional installation recommended.