The Invidia HS08ST5GM4SS Gemini R400 cat-back exhaust is engineered to fill the sound gap between the Q300 and N1 — delivering an aggressive, rich exhaust note without harsh cabin noise at highway speeds. Designed for the 2011–2014 Subaru WRX Hatchback and 2008–2014 STI Hatchback, it combines high-flow performance with tuned mufflers for optimized sound and exhaust flow.

Key Features

• +17 WHP and +26 ft-lbs torque
• 76mm diameter, 1.5mm thick mandrel-bent SUS304 stainless steel piping
• Tuned mufflers — aggressive note, minimal cabin drone at highway speeds
• Cast flanges for optimum fitment and durability
• Machine-welded construction for uniform strength and clean appearance
• Straight-cut stainless steel quad tips
• Lifetime warranty (see Invidia terms and conditions)

Important Note

If running a stock J-pipe or downpipe, the GrimmSpeed Stock DP to Aftermarket 3" Catback Adapter (p/n 077046) is required. Representative photo — actual product may vary.

Vehicle Fitment

• 2011–2014 Subaru WRX Hatchback
• 2008–2014 Subaru WRX STI Hatchback

Specs

• Part Number: HS08ST5GM4SS
• Piping: 76mm, 1.5mm wall, mandrel-bent SUS304 stainless steel
• Tips: Straight-cut stainless steel quad outlet
• Power: +17 WHP / +26 ft-lbs torque