silent Hi-Power IMPREZA Explanation of the product Application chart

Code No. 31019-AF026

Cert. No. JQR300931364

Model GRF
Engine EJ25(TURBO)
Model Year 09/02 - 14/08
Shape of muffler HP SC (silent Hi-Power)
Main material S304(*2)
Diameter of tip 94 L&R
Diameter of center pipe 65(*3)
Close noise level Stock L81 R81
HKS L90 R91
About road clearance(*4) Clearance 156mm
Portion of the kit Main silencer
Product Weight


Fit to stock option STI exhaust finisher.


About HKS muffler

*1: About silencer shell type of Silent Hi-Power
TYPE-S/Oval silencer for noise reduction.
TYPE-H/Round silencer for performance.

*2: Main material in the component figure.

: SUS304/High quality stainless steel.
: SUH409/Stainless steel commonly used for stock exhaust.

*3: 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.

*4: 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.