HKS 3106-EX008 Hi-Power Catback Exhaust for 2002-2007 Subaru WRX/STI

Vehicle Fitment

• 2002-2007 Subaru WRX (Turbo AWD, EJ20/EJ25)
• 2004-2007 Subaru WRX STI (Turbo AWD, EJ25)

Features

• Premium Hi-Power catback exhaust system engineered by HKS
• Straight-through muffler design for improved exhaust flow
• Race-inspired offset piping layout reduces backpressure
• Produces deeper, more aggressive exhaust tone
• Enhanced mid-range boost response and high-RPM power
• Durable stainless steel construction resists corrosion
• Polished large diameter exhaust tip for classic JDM look
• Direct bolt-on replacement - retains OEM hanger locations

Specifications

• Part Number: HKS 3106-EX008
• System Type: Catback exhaust
• Piping Diameter: Approx. 75 mm (3")
• Exhaust Tip Diameter: Approx. 120 mm
• Material: SUS304 stainless steel muffler/tip & SUH409 piping
• Orientation: Angled exit tip
• Fitment: Turbo AWD applications only
• Note: May not clear vehicles with optional rear differential skid plate

Included Components

• 1x HKS Hi-Power catback exhaust assembly
• 1x Gasket set
• Hardware kit (bolts, nuts, clamps as required)
• Installation instructions

Product Description

The HKS 3106-EX008 Hi-Power Catback Exhaust is a performance-oriented exhaust upgrade designed specifically for Subaru WRX (2002-2007) and WRX STI (2004-2007) turbo AWD models. Built with a straight-through design and high-flow piping, this system reduces backpressure and increases exhaust flow compared to stock, helping to improve throttle response, turbo spool characteristics, and high-RPM power delivery while delivering the signature deep, aggressive exhaust note enthusiasts crave.

Constructed from high-quality stainless steel materials, the Hi-Power exhaust resists corrosion and offers long-lasting durability for daily driving or spirited use. The large diameter tip and polished finish provide a classic JDM aesthetic, while the bolt-on design uses OEM hanger locations for relatively straightforward installation. Note that on some models the optional factory rear differential skid plate may interfere with this exhaust, so clearance should be checked prior to installation.