Super Turbo Muffler Cat-Back Exhaust - Part Number 31029-AF013

• 2015–2021 Subaru | WRX STI

The HKS Super Turbo Muffler cat-back exhaust is designed for 2015-2021 Subaru WRX STI models (JDM VAB chassis, EJ20; VA chassis in the US market). Part number 31029-AF013 provides a performance-focused exhaust upgrade while maintaining a clean, refined appearance suitable for street-driven vehicles.

Built by HKS in Japan, the Super Turbo Muffler replaces the factory exhaust components downstream of the catalytic converter to improve the vehicle's exhaust flow and overall performance character. Its muffler-focused design is intended to deliver a sportier exhaust note without relying on an excessively aggressive presentation. The system uses a non-reduction straight-through design with highly efficient silencers and the original slit-design Ti-1 titanium tail (90mm x 2), for high performance with subdued exhaust notes - quiet enough to cruise and hold a normal conversation, yet capable of supporting most standard high-tuned applications.

• Cat-back exhaust system by HKS; Super Turbo Muffler series
• SUS304 stainless steel piping and silencers; Ti-1 titanium tails
• 90mm x 2 tails; 75-60-54mm center pipe diameter
• Meets the JASMA performance exhaust sound standard
• 4-piece layout; includes center pipe
• Direct bolt-on for the listed WRX STI applications
• HKS part number 31029-AF013

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