Super Turbo Muffler IMPREZA WRX STI Explanation of the product Application chart

Code No. 31029-AF005

Extremely Low Exhaust Pressure!!
The 75φ straight structure enables higher level tuning to 500ps.
Comfortable Driving with Less Noise
The lower exhaust resonance and interior noise under street driving were reduced.
Use with HKS Metal Catalyzer allows higher performance.

Cert. No. JQR20122093

Model GRF
Engine EJ25(TURBO)
Model Year 09/02 - 14/08
Shape of muffler SSR
(Super Turbo Muffler)
Main material S304
Diameter of tip 124 L&R
Diameter of center pipe 75-60 x 2(*1)
Close noise level Stock 81
HKS 90
About road clearance(*2) Clearance 146mm
Portion of the kit Center pipe
Product Weight


Center pipe included. Fit to stock option STI exhaust finisher.


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.