
Code No. 31006-BF003
Aggressive looks and sound, combined with low back pressure for greater tuning potential.




| 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 | |
*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
●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
●Tail Tip Adjustment


Adjustable Tail Tip
●Layout Comparison

*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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