Code No. 31021-BH004



Overwhelming Low Exhaust Pressure - 50% of Original Pressure
φ60 large diameter pipe and full straight structure reduce the exhaust pressure to 50% of the stock.
This significant exhaust pressure reduction enables the turbine to run smoothly from low RPM range, which results in the engine output increase in an entire speed range.
Also, this pressure reduction effect is enhanced as the tuning level becomes more advanced; the engine output can be increased to450ps without engine power-loss.









Cert. No.
Vehicle CIVIC
Model FC1
Engine L15B
Model Year 16/** - 
Shape of muffler Ti Tip
(LEGAMAX Premium)
Main material S304
Diameter of tip 75
Diameter of center pipe 60 (50) (*1)
Close noise level Stock 72
HKS 79
About road clearance(*2) Clearance 120
Portion of the kit
Remarks For a vehicle equipped with HKS suspension
Product Weight


About HKS muffler

*1: About center pipe
Diameter of center pipe is the portion that has the largest diameter. (Excluding silencer and tip.) It is the condition with stock suspension.

*2: Minimum road clearance between HKS muffler (Any parts included in the kit) and road surface. Therefore, it may be different from actual road clearance of the vehicle.
The data is basically the condition with stock suspension. However, please understand that some items have data with low down spring or ride height adjustable suspension kit.

Caution: Hook, bracket, stay may be changed without prior notice.

★ Exhaust noise level at idle.