Hi-Power Muffler
WRX STI
WRX STI VAB

Code No. 31006-BF003

 

 

 

Aggressive looks and sound, combined with low back pressure for greater tuning potential.

 

 

■Features

  • Striking Presence
    Featuring an 85mm pipe and a bullet-style muffler with a single right-side exit, it delivers an overwhelming presence and a distinctly race-inspired look.
  • Volume control for every driving scene
    The inner silencer can be attached or removed to control both volume and tone. Keep it moderate for city driving, or remove it for a more aggressive, sporty sound for the track.
  • Adjustable tail tip
    The adjustable tail tip allows you to adjust how far the tail extends, letting you achieve your ideal, personalized style.

 

 

 

 

Cert. No.
Vehicle WRX STI
Model VAB
Engine EJ20(TURBO)
Model Year 14/08 - 20/04
Shape of muffler HP (Titan)
(Hi-Power Muffler)
Main material S4, S3
Diameter of tip 119
Diameter of center pipe 74.7 ⇒ 85.0 (*1)
Close noise level Stock 81
HKS 96
About road clearance(*2) Clearance 115mm
Portion of the kit Mid-pipe
Remarks
Product Weight 18.4kg
Remarks

 

*Note: Proximity exhaust noise measured according to California standards. Sound level recorded at 75% of maximum engine RPM.
*The data shown in the table was obtained from a vehicle equipped with the FA20.

 


 

●Performance

*The graph above shows the relationship between airflow and pressure measured using an in-house flow bench. Lower pressure at a given airflow indicates reduced exhaust back pressure.

 

Reduced Exhaust Back Pressure

  • Featuring dramatically lower exhaust back pressure than the stock system, it improves exhaust flow for sharper throttle response and allows the engine to deliver its full performance potential.

 

 

●Sound Pressure

*Note: Proximity exhaust noise measured according to California standards.
Sound level recorded at 75% of maximum engine RPM.

 

Enjoy Sound Adapted to the Scene

  • With the inner silencer installed, this exhaust delivers a subdued sporty tone. Removing it  transforms the sound into a powerful, racing-inspired roar.

 

 

●Tail Tip Adjustment

 

Adjustable Tail Tip

  • The tail tip features a sliding adjustment mechanism, allowing you to customize the protrusion to your preference and enjoy a personalized look.

 

 

●Layout Comparison

  • Aggressive Presence with Exceptionally Low Back Pressure
    By increasing the pipe diameter from the factory 60 mm to 85 mm, the system delivers a bold and commanding appearance. In addition, the straight-through silencer design eliminates internal restrictions, significantly reducing exhaust back pressure. The result is a noticeable improvement in driving performance and responsiveness.
  • Significant Weight Reduction
    Switching from a quad-exit to a single-exit and removing the mid-silencer results in a significant weight reduction, enhancing overall driving performance.

 

 

 


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.

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HKS