HKS LEGAMAX Sport Catback Exhaust (2022+ WRX)

Performance & Sound Engineering

• • Utilizes a gradual pipe diameter reduction: from 74.7 mm → 60.5 mm × 2 → 45 mm × 4. This layout lowers exhaust pressure, improves flow, and diminishes unwanted noise—all enhancing both performance and sound quality

  • Tuned to deliver a refined bass tone at idle, evolving into a sporty, high-pitched note under acceleration. The system highlights the character of the boxer engine while minimizing resonance and drone

Aesthetic & Build Quality

• • Features a symmetrical quad-tip layout with 98 mm titanium tailpipes, crafted to ensure an aggressive visual stance while maintaining ride height and ground clearance

  • Constructed from S304 stainless steel, featuring TIG-welded mufflers and a specially baked titanium finish of striking gradation—meticulously handcrafted for precision and durability

Noise Levels & Clearance

• • Close Noise Level: Increases from the stock 79 dB to 90 dB with the HKS system; idle noise remains modest at around 63 dB

  • Minimum Road Clearance: Preserves a 130 mm clearance with no additional lowering required

Design Philosophy

Developed under the guiding principles of performance, sound quality, and aesthetics. The longer pipe design accentuates sporty high-frequency tones (around 500 Hz), while the expanded cross-sectional flow area (via four 45 mm pipes) enhances both power and acoustic richness. The layout also thoughtfully accommodates vehicle underbody space and mounting points with precision

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