HKS Hi-Power Cat Back Exhaust Subaru Impreza WRX STI 2015+

Shape of muffler

HP(Titan) (Hi-Power)

Main material

S304(*2)

Diameter of tip

97 L&R

Diameter of center pipe

74.7-60.5 x 2(*3)

Close noise level

Stock

HKS

90

About road clearance(*4)

Clearance

Portion of the kit

Remarks

About silencer shell type of Silent Hi-Power

TYPE-S/Oval silencer for noise reduction.
TYPE-H/Round silencer for performance.

Main material in the component figure.

：

SUS304/High quality stainless steel.

：

SUH409/Stainless steel commonly used for stock exhaust.

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.

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 Hi-Power Muffler came back with the same concept, "High Power & High performance" and "Resonant Sound" and "Stylish" are harmonized together.

High performance for stock to high performance vehicles with upgraded turbines and sound quality me the JASMA standard are implemented together. This had been impossible in a long exhaust tuning history.

To maintain the exhaust efficiency, enlargement of the exhaust pipe is usually required; the sound level tends to be increase and low-tone. The exhaust system with a cannon ball-shaped shell usually has lower silencer capacity than an oval-shaped shell; therefore, to reduce the sound level, the pipe diameter is narrowed. However, a narrow pipe diameter also reduces the exhaust efficiency and increase the exhaust pressure.
HKS utilized original unique technology to maintain the exhaust capacity and sound level to meet the JASMA standard which is more severe than the regular safety standard. Inner structure of the silencer was redesigned so the unwanted low exhausts resonance was eliminated, and the sound quality was improved.

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Titanium Color Exhaust Tip

Brightly shined titanium color tips are used for GT-R and Silvia.
This tip is made of stainless (SUS304) which improve appearance and cost-performance.

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* Data is based on the test results of a prototype for RB26.

Exhaust Dress-up Evolution &
Safety regulations applicable.

Powerful rear view with the cannon ball-shaped & modern titanium color tips improve the appearance.
Tuning cars race in circuits for a time attack have improved the appearance more stylish.
To maintain large exhaust capacity, the pipe diameter of the exhaust pipe installed on the bottom of a vehicle must be enlarged, and the ground clearance must be narrow. HKS Hi-Power Muffler was designed to maintain sufficient ground clearance with redesigned flanges and layout.