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Regular price $10,000.00 USD
Regular price Sale price $10,000.00 USD
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The digital control valve exhaust system for sound pressure and exhaust efficiency. It's always challenge to acquire both quietness and high output for automobile. To comply for turbo upgraded for R35 GT-R, we have developed changeover valve system muffler. So depending on the exhaust flow, the flow channel can be changed to give more power and cool exhaust sound.

2 valves in front and 2 valves in the back operated by electric motor. The valves are connected to the motor with cables and special unit controls the motor.

In the automatic mode, the valves are opened or closed by the RPM or automobile speed. For low RPM (Stage 1), all the valves are closed which provides quiet sound. For mid RPM (Stage 2), only the back valves are open for both power and quietness is provided. And finally for high RPM (Stage 3), all the valves are open for the most power. Also the manual mode let you open all the valves.

The finisher has a special surface work that make hard for soot to stick to.

A special metal emblem comes with the kit.

This graph shows each 3 stages testing. We have analyzed muffler's sound pressure and exhaust balance and set the switching point of the stages. (When driving, it automatically changes)



 Make Nissan
 Model GT-R
 Product Number 31025-AN006-08-11
 Engine VR38DETT

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.



Other HKS Products available for any chassis/engine - if you don't see what you’re looking for please message us directly. We shop our competition - if you find a lower comparable price we will match or beat it - message for details!

PROPOSITION 65 WARNING: These products may contain chemicals known to the State of California to cause birth defects or other reproductive harm. For more information visit


HKS is perhaps the most known aftermarket brand in the world.

In October 1973, two talented and spirited young engineers had a vision; to design and build high performance engines and components that major OE manufacturers could not or would not produce.
Led by Hiroyuki Hasegawa, a former engineer for Yamaha Motor Company, and his partner Mr.Kitagawa, the two secured a capital infusion from Sigma Automotive Co., Ltd. (hence the name “HKS ”), and began tuning gasoline powered engines in a dairy-farming shed at the foot of Mount Fuji in Japan.
A year later, Mr. Hasegawa designed and built the first aftermarket turbocharger for passenger cars and has never looked back.
HKS pioneered the Japanese aftermarket performance industry by delivering a host of exciting new products, including the first commercially available electronic turbo timer and boost controller. Other early products included piggy-back fuel computers and sophisticated fuel management tools. Clearly HKS was Driving Performance trends for Japanese vehicles.