The HKS LEGAMAX SPORTS Exhaust System for the 2023+ Toyota GR Corolla is a precision-engineered cat-back upgrade designed to enhance the performance and sound character of the G16E-GTS 1.6L turbocharged engine without sacrificing daily drivability.
Built specifically for chassis code GZEA14H, this system replaces the factory exhaust from the catalytic converter back and eliminates the OEM valve assembly while maintaining proper ECU functionality via the included Exhaust Error Canceller.
HKS developed this system to improve exhaust efficiency through optimized piping diameter and carefully tuned muffler construction. The result is sharper throttle response, stronger mid-range torque feel, and a deeper, more aggressive exhaust tone that remains refined during highway cruising.
For GR Corolla owners looking for a balanced street and track solution — not an overly loud “look at me” system — the LEGAMAX SPORTS delivers the exact character the GR platform deserves.
Vehicle Fitment: 2023+ Toyota GR Corolla (GZEA14H)
Engine: G16E-GTS 1.6L Turbocharged 3-Cylinder
HKS Part Number: 31021-AT009
System Type: Cat-Back Exhaust
Configuration: Valve-less design (Exhaust Error Canceller included)
Material: SUS304 Stainless Steel
Main Pipe Diameter: 74.7mm → 60.5mm x 2
Tip Diameter: Approximately 119mm dual outlets
Approximate System Weight: ~18kg
Ground Clearance (mid-pipe): Approx. 135mm
Direct Bolt-On Fitment
Engineered specifically for the GR Corolla chassis with factory mounting points for proper alignment and clean installation.
Premium SUS304 Construction
High-grade stainless steel provides long-term corrosion resistance and durability in all climates.
Dual Large-Diameter Slash Tips
Aggressive 119mm tailpipes enhance the rear profile of the GR Corolla while maintaining OEM-like placement.
Valve-Less Simplicity
Eliminates the factory exhaust valve assembly while retaining proper ECU operation via the included error canceller.
Optimized Flow Design
74.7mm main piping transitioning into dual 60.5mm outlets improves exhaust scavenging and supports performance gains when paired with intake and tuning upgrades.
Balanced Acoustic Engineering
Produces a deeper, more authoritative tone under load while remaining controlled during steady cruising to minimize cabin drone.
Improved Throttle Response
Reduced backpressure allows the turbocharged G16E-GTS engine to breathe more efficiently, improving engine responsiveness.
Stronger Mid-Range Feel
Enhanced exhaust flow characteristics complement the GR Corolla’s torque curve.
Refined Performance Sound
Idle remains composed, but acceleration produces a sharper, motorsport-inspired exhaust note without excessive harshness.
Track-Ready Yet Street-Friendly
Designed for enthusiasts who daily drive their GR Corolla but want a more engaging driving experience during spirited use.
The GR Corolla is built around balance — lightweight chassis, responsive turbo engine, AWD traction. The HKS LEGAMAX SPORTS exhaust complements that balance instead of overpowering it.
Rather than chasing maximum volume, this system enhances the car’s natural character. It improves response, adds depth to the sound profile, and maintains daily usability.
For owners building a refined street car or preparing for bolt-on tuning packages, this exhaust is a foundational upgrade.
Does this exhaust fit all GR Corolla trims?
It is designed for 2023+ Toyota GR Corolla models (GZEA14H). Always confirm specific trim compatibility before ordering.
Do I need tuning to install this exhaust?
No tuning is required for installation. However, pairing this exhaust with intake upgrades and ECU tuning can maximize performance gains.
Will this trigger a check engine light?
No. HKS includes an Exhaust Error Canceller to prevent fault codes related to the removal of the OEM exhaust valve.
How loud is it compared to stock?
It is moderately louder than stock with a deeper tone. Idle and cruising remain controlled, while acceleration becomes noticeably more aggressive.
Is there highway drone?
The LEGAMAX SPORTS is engineered to minimize drone. While slightly louder than factory, it is suitable for daily driving.
What material is it made from?
The system uses high-grade SUS304 stainless steel for corrosion resistance and longevity.
Is installation difficult?
This is a direct bolt-on cat-back system. Installation can typically be completed with standard tools. Professional installation is recommended if you are unfamiliar with exhaust work.
The HKS LEGAMAX SPORTS Exhaust System for the 2023+ Toyota GR Corolla is a precision-engineered cat-back upgrade designed to enhance the performance and sound character of the G16E-GTS 1.6L turbocharged engine without sacrificing daily drivability.
Built specifically for chassis code GZEA14H, this system replaces the factory exhaust from the catalytic converter back and eliminates the OEM valve assembly while maintaining proper ECU functionality via the included Exhaust Error Canceller.
HKS developed this system to improve exhaust efficiency through optimized piping diameter and carefully tuned muffler construction. The result is sharper throttle response, stronger mid-range torque feel, and a deeper, more aggressive exhaust tone that remains refined during highway cruising.
For GR Corolla owners looking for a balanced street and track solution — not an overly loud “look at me” system — the LEGAMAX SPORTS delivers the exact character the GR platform deserves.
Vehicle Fitment: 2023+ Toyota GR Corolla (GZEA14H)
Engine: G16E-GTS 1.6L Turbocharged 3-Cylinder
HKS Part Number: 31021-AT009
System Type: Cat-Back Exhaust
Configuration: Valve-less design (Exhaust Error Canceller included)
Material: SUS304 Stainless Steel
Main Pipe Diameter: 74.7mm → 60.5mm x 2
Tip Diameter: Approximately 119mm dual outlets
Approximate System Weight: ~18kg
Ground Clearance (mid-pipe): Approx. 135mm
Direct Bolt-On Fitment
Engineered specifically for the GR Corolla chassis with factory mounting points for proper alignment and clean installation.
Premium SUS304 Construction
High-grade stainless steel provides long-term corrosion resistance and durability in all climates.
Dual Large-Diameter Slash Tips
Aggressive 119mm tailpipes enhance the rear profile of the GR Corolla while maintaining OEM-like placement.
Valve-Less Simplicity
Eliminates the factory exhaust valve assembly while retaining proper ECU operation via the included error canceller.
Optimized Flow Design
74.7mm main piping transitioning into dual 60.5mm outlets improves exhaust scavenging and supports performance gains when paired with intake and tuning upgrades.
Balanced Acoustic Engineering
Produces a deeper, more authoritative tone under load while remaining controlled during steady cruising to minimize cabin drone.
Improved Throttle Response
Reduced backpressure allows the turbocharged G16E-GTS engine to breathe more efficiently, improving engine responsiveness.
Stronger Mid-Range Feel
Enhanced exhaust flow characteristics complement the GR Corolla’s torque curve.
Refined Performance Sound
Idle remains composed, but acceleration produces a sharper, motorsport-inspired exhaust note without excessive harshness.
Track-Ready Yet Street-Friendly
Designed for enthusiasts who daily drive their GR Corolla but want a more engaging driving experience during spirited use.
The GR Corolla is built around balance — lightweight chassis, responsive turbo engine, AWD traction. The HKS LEGAMAX SPORTS exhaust complements that balance instead of overpowering it.
Rather than chasing maximum volume, this system enhances the car’s natural character. It improves response, adds depth to the sound profile, and maintains daily usability.
For owners building a refined street car or preparing for bolt-on tuning packages, this exhaust is a foundational upgrade.
Does this exhaust fit all GR Corolla trims?
It is designed for 2023+ Toyota GR Corolla models (GZEA14H). Always confirm specific trim compatibility before ordering.
Do I need tuning to install this exhaust?
No tuning is required for installation. However, pairing this exhaust with intake upgrades and ECU tuning can maximize performance gains.
Will this trigger a check engine light?
No. HKS includes an Exhaust Error Canceller to prevent fault codes related to the removal of the OEM exhaust valve.
How loud is it compared to stock?
It is moderately louder than stock with a deeper tone. Idle and cruising remain controlled, while acceleration becomes noticeably more aggressive.
Is there highway drone?
The LEGAMAX SPORTS is engineered to minimize drone. While slightly louder than factory, it is suitable for daily driving.
What material is it made from?
The system uses high-grade SUS304 stainless steel for corrosion resistance and longevity.
Is installation difficult?
This is a direct bolt-on cat-back system. Installation can typically be completed with standard tools. Professional installation is recommended if you are unfamiliar with exhaust work.
