RACING MUFFLER IMPREZA Explanation of the product Application chart

Code No. 31701-BF003

Cert. No.

Model GDA, GDF
Engine EJ20(TURBO), EJ25(TURBO)
Model Year 02/** - 07/**
Shape of muffler HP (Titan)
Main material S304
Diameter of tip 115
Diameter of center pipe 74.7(*1)
Close noise level Stock 82
HKS 96
About road clearance(*2) Clearance
Portion of the kit
Product Weight


・Silencer and tip were made of titanium. Their weights are 10.9kg (4.3kg lighter than the factory's.)
・Pipes layout was almost straight.
・This product was designed on a USDM vehicle.


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.