HKS Legamax Sport – Civic Type-R FL5

The HKS Legamax Sports exhaust (part number 31021-AH005) is a high-performance exhaust system designed specifically for the Honda Civic Type-R FL5. It reduces exhaust back-pressure significantly while delivering a sportier, aggressive sound without compromising daily driveability.

Key Features & Benefits

• Reduced exhaust pressure – Up to ~30% lower than the stock exhaust system, improving flow and supporting performance gains, especially with tuning.

• Full-straight pipe design – Optimised for maximum exhaust flow with minimal restrictions.

• Titanium dual tailpipes (φ119 mm) – Premium finish with weight savings and HKS branding.

• Pipe diameters – Center pipe transitions from φ74.7 mm to dual φ60.5 mm, larger than stock for better flow.

• Valveless design with actuator – Removes factory valves for unrestricted performance while including an actuator to prevent OBD error codes.

• Sound tuning – Idle noise around 73 dB, increasing to about 93 dB under load. Designed to be sporty without being excessively loud during light throttle or cruising.

• Road clearance – Minimum clearance of approximately 125 mm with stock suspension.

Materials & Build

• Main material: SUS304/SUS304L stainless steel.

• Tail tips: Titanium, dual exit.

• Muffler design: Bullet-style silencer, tuned for balanced bass and treble tones.

Fitment & Specifications