HKS 31029-AF001 Super Turbo Muffler Exhaust System for 04-07 Subaru WRX STI GDB

Vehicle Fitment

• 2004-2007 Subaru Impreza WRX STI (GDB, EJ20 Turbo, Applied Models E-G)

Features

• Designed for both stock and high-performance vehicles with upgraded turbines
• Meets JASMA standards for performance exhaust sound
• Unique exhaust sound tailored specifically for the EJ20 engine
• Constructed from high-quality SUS304 stainless steel for durability
• Single rear exit with a 124 mm titanium burnt tip for a sporty appearance
• Oval muffler body shape with a straight-through design for optimal exhaust flow
• Maintains all emissions equipment intact without any modifications

Specifications

• Exhaust System Type: Cat-Back
• Material: SUS304 Stainless Steel
• Main Pipe Diameter: 75 mm (3.0 inches)
• Tip Diameter: 124 mm (4.9 inches)
• Tip Material: Titanium
• Tip Finish: Burnt
• Tip Style: Round
• Tip Quantity: 1
• Exit Location: Single Rear
• Close Noise Level: Stock - 84 dB; HKS - 91 dB
• Minimum Road Clearance: 118 mm
• Certification Number: 03S15238
• Part Number: 31029-AF001

Included Components

• 1x Super Turbo Muffler Assembly
• 1x Center Pipe
• Gaskets and necessary hardware for installation
• Installation Instructions

Product Description

The HKS 31029-AF001 Super Turbo Muffler is engineered to enhance the performance and sound of the 2004-2007 Subaru Impreza WRX STI (GDB, EJ20 Turbo, Applied Models E-G). This cat-back exhaust system features a straight-through design with a center resonator, optimizing exhaust efficiency while reducing sound pressure.

Constructed from high-quality SUS304 stainless steel, the system includes a 75 mm (3.0 inches) main pipe leading to an oval-shaped muffler body, culminating in a 124 mm (4.9 inches) titanium burnt tip. This design not only provides a unique and sporty exhaust note tailored to the EJ20 engine but also ensures durability and corrosion resistance.

The Super Turbo Muffler maintains all emissions equipment intact, meeting JASMA standards for performance exhaust sound. With a close noise level of 91 dB (compared to the stock 84 dB), it offers a more aggressive tone without compromising comfort. The system achieves a minimum road clearance of 118 mm, ensuring compatibility with stock suspension setups.

Ideal for enthusiasts seeking a balance between performance, sound, and compliance, the HKS 31029-AF001 Super Turbo Muffler delivers a refined driving experience for both daily driving and spirited performance.