The long-awaited Gen2 compatible muffler is here!
Pursuing sound, performance, and high-quality, sophisticated appearance.

■Features

• The Super Turbo Muffler combines low exhaust pressure with quietness available in URBAN MATTE EDITION, maintaining the powerful sporty sound and extremely low exhaust pressure.
• The tail features our URBAN MATTE tail, and the silencer peeking out from the bumper provides a sleek finish.
• The simple yet striking URBAN MATTE EDITION gives off a soft, elegant light, creating a calming atmosphere.
• HKS rubber stays and a special bracket are included to reduce lateral movements of the muffler during sporty driving.

Remarks

Compatible with AT and MT. Not compatible with vehicles with 17-inch wheels or rear constant speed differentials. Cannot be installed on Gen 1 vehicles

●Performance comparison

• The maximum values for both power and torque exceeded the stock system
• When measuring the power output, we also measured the exhaust pressure (*). As the engine speed increased, the difference became larger, confirming a significant reduction in exhaust pressure.
• With improved exhaust efficiency, making a muffler that will show its true value in further tuning!!

Power/ Torque maximum value

Notes regarding the notations in the graph and table:
STM: Super Turbo Muffler 31029-AT017 (used for testing)

• Exhaust pressure is measured between the spherical flange and the middle silencer.
• The output gain with this product is calculated based on values under the stock ECU control.
• Graphs and figures are the results of in-house testing. They may vary depending on the vehicle and measuring equipment.

Test Vehicle: GR Yaris 4BA-GXPA16
Vehicle Specs: Super Turbo Muffler　31029-AT017
(All other parts were stock)

●Appearance & Layout Comparison

31029-AT018

The knowledge cultivated through the development of the previous gen GR Yaris and GR Corolla has been fully utilized!

• This product was developed based on data accumulated from the development of the earlier gen GR Yaris and GR Corolla, and the optimal layout, including silencer configuration and pipe length, was derived.
• It controls unpleasant low tones and reduces muffled noise inside the car at normal RPMs, while producing a sporty sound making it clear that you have changed the muffler!
• The rich low tones have a strong feel, and the sound quality matches the powerful feeling of the GR Yaris.
• It has a two-part configuration of an intermediate and a main muffler.

GR Yaris Stock Muffler

• Immediately after the flange the pipe is becomes 70mm
• After the intermediate silencer, it becomes 65mm.
• The silencer is designed to distribute the exhaust to the left and right.
• One piece structure with no divisions.

●Appearance comparison

31029-AT018 Super Turbo Muffler  URBAN MATTE EDITION

• The main silencer has a hairline finish, giving it a smooth and elegant texture.
• The tail has a matte finish and is engraved with the HKS logo, giving it a calm impression. This simple yet striking muffler adds a high-quality accent to the rear view of your GR Yaris.

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.