HKS Toyota GR Corolla LEGAMAX Sports Catback Exhaust System - 2023+ Toyota GR Corolla

HKS offers the LEGAMAX Sports Exhaust for the GR Corolla, increasing performance while maintaining sound quality that HKS is known for. A worthy system for anyone who wants quality proven behind exceptional engineering.

HKS provide an "EXHAUST ERROR CANCELLER" to prevent error codes when the valve is not in use, allowing for a worry-free experience. (PN: G89580-T76010-00)

Features:

• Valve-less, Dual Tail Tip Layout: This exhaust system features a valve-less design and dual tail tip layout. The large-diameter titanium slash tailpipe creates a commanding rear view, leaving a strong impression compared to the stock exhaust.
• Sturdy and Aesthetic Bracket Placement: Brackets connecting the left and right silencers are positioned at the center notch and feature the HKS logo, ensuring both visual appeal and structural integrity.
• Includes "EXHAUST ERROR CANCELLER": HKS provide an "EXHAUST ERROR CANCELLER" to prevent error codes when the valve is not in use, allowing for a worry-free experience. (Use w/ PN G89580-T76010-00)
• Smooth and Enjoyable Driving: Experience a comfortable and noise-free ride at low revs. The overall sound quality is robust, delivering a deep bass sound that intensifies as the revs increase, providing a powerful auditory experience
• Sound levels: 91/90dB (idle: 71/70dB), stock is 88dB (idle: 70dB)

Advantages of installing HKS LEGAMAX Sports

The two-piston layout has been meticulously designed to maintain low exhaust pressure across all engine speeds.
In the low and mid-range of the engine, where the valves close in the stock setup, you can revel in a robust sports sound without any unwanted muffled noise!

Flow rate

Stock - Valve Closed: This setting secures the valve on the stock muffler in the closed position.
Stock - Valve Open: This setting fixes the valve in the open position on the stock muffler.
HKS: LEGAMAX Sports 31021-AT009 (this product）

The graph above illustrates the relationship between flow rate and pressure, as measured on a flow bench. Lower pressure relative to flow rate indicates reduced resistance. At a flow rate of 200 L/s, the respective pressures are as follows:
Stock - Valve Closed: 9.3 kPa
Stock - Valve Open: 5.1 kPa

These results demonstrate that compared to the closed valve and this product, pressure is reduced by 68%, even when the valve is open, a 41% reduction in pressure is achieved. This reduction is attributed to the pipe diameter, layout, and internal structure of the silencer, which collectively contribute to significantly lowering exhaust pressure

EXHAUST ERROR CANCELER

Regarding the genuine muffler's exhaust switch valve, the manufacturer's website defines its
purpose as follows:
Achieving low exhaust pressure at high engine speeds.
Delivering a sporty sound when the valve is open.
Ensuring comfortable cruising at low and medium engine speeds.

These functions are carried out through the motor-controlled operation of the valves.
If the valve is not used when installing this product, the following situations may occur:
1. If the coupler is left disconnected: An error code will occur.
2. If the entire motor for the valve is disconnected from the genuine muffler during idling condition: An error code will occur.

In both cases, the check engine lamp may not illuminate, but a record of disconnection or motor abnormality will be stored. To identify and diagnose these errors, it is necessary to use an OBD2 diagnostics machine.

As OBD vehicle inspections are set to commence, there is still a concern about the possibility of error codes being triggered.

The "EXHAUST ERROR CANCELER" is an electrical component designed to prevent errors related to the exhaust system. When connected, it ensures that no error codes are recorded, and no warning check engine lamps are illuminated. This part is designed based on the manufacturer's error countermeasure information, and its installation will not cause any issues with the vehicle.

By implementing measures to address error codes, which are a concern when the valve is not used, this product provides a stress-free and safe solution for your vehicle's exhaust system. It effectively prevents errors and maintains the smooth operation of your vehicle.

The provided graphs and figures are based on in-house measurements and are subject to variation depending on the specific vehicle and measuring equipment used. Actual results may differ based on individual vehicle characteristics and the type of measuring equipment utilized

The installation of the muffler has proven effective in enhancing power and torque in the mid-range RPMs.

The output has increased by up to 4.0%, while torque has seen an improvement of up to 5.2%. This reflects the positive impact of the muffler on the vehicle's performance within that RPM range