Description

The HKS LEGAMAX Sports Exhaust is a high-performance cat-back system engineered to enhance the driving experience of the GR Corolla. Featuring a true dual-exit, valveless design with large-diameter 119mm titanium slash-cut tailpipes, it delivers a powerful, bass-rich exhaust note while maintaining a comfortable cabin environment at low RPMs. It combines aggressive styling with reduced exhaust backpressure, improved throttle response, and includes an error canceller to seamlessly integrate with the factory system.

Product Overview

This system replaces the complex, valve-equipped factory muffler with a simpler, more efficient dual-exit layout. The focus is on improving exhaust flow for better engine response, delivering a more engaging and powerful soundtrack, and transforming the rear aesthetic with a bold, symmetrical look. It is designed as a balanced upgrade for daily driving and spirited performance, without excessive volume or drone.

Product Highlights

🎵 Powerful Yet Refined Sound Character
Engineered to eliminate unpleasant low-RPM resonance (“muffled noise”) for quiet, comfortable cruising. As engine speed rises, it delivers a deep, powerful bass note that builds into a thrilling, authoritative roar at high RPM—enhancing the turbocharged character without compromising daily civility.

🔧 Efficient Dual-Exit, Valveless Design

• True Dual Exit Layout: Replaces the single-outlet factory design with symmetrical left and right exhaust paths, reducing backpressure and improving flow for potential power gains.

• No Valves, No Complexity: Eliminates the factory’s active exhaust valve, simplifying the system. The included “Exhaust Error Canceller” prevents check engine lights by simulating the valve’s signal, ensuring seamless electronic integration.

✨ Aggressive Titanium Aesthetic
Features large, imposing 119mm titanium slash-cut tailpipes that fill the rear valance with a motorsport-inspired presence. The polished titanium finish provides a distinctive, high-end look. A centrally mounted HKS-branded bracket connects the two mufflers, adding structural rigidity and visual detail.

⚙️ Improved Exhaust Flow & Response
By utilizing a dual-pipe design (φ60.5 x 2) and optimizing the muffler internals, the system reduces exhaust restriction compared to stock. This contributes to sharper throttle response and improved turbo spool characteristics, allowing the G16E-GTS engine to breathe more efficiently.

Technical Specifications & Compatibility

• Product Name: LEGAMAX Sports Exhaust

• Model Code: 31021-AT009

• Compatibility: Toyota GR Corolla (GZEA14H, G16E-GTS, December 2022+). *Not compatible with Morizo Edition or post-March 2025 model change vehicles.*

• Configuration: Cat-Back, Dual Exit, Valveless.

• Tailpipes: 119mm Titanium Slash-Cut.

• Material: Main S304 Stainless Steel.

• Key Feature: Includes Exhaust Error Canceller.

• Certification: Includes official certification number (JQR30232128).

• Weight: 18.0 kg.

Performance Philosophy

• Goal: To provide a noticeable enhancement in sound, aesthetics, and throttle response while retaining excellent daily drivability. The focus is on a balanced, high-quality performance upgrade that amplifies the car’s sporty character without introducing harshness or inconvenience.

• Focus: The ideal daily-driver performance exhaust for the GR Corolla enthusiast. It is designed for owners who want a more engaging and aggressive exhaust note, improved looks, and better response, but who also value refinement and a lack of drone during highway cruising.

Installation & Usage Notes

• 🔧 Professional Installation Recommended
  Installation involves removing the factory system and installing the new cat-back section, along with wiring the error canceller. Professional installation ensures proper fitment, sealing, and secure mounting of the heavy dual mufflers.

• ⚠️ Critical Compatibility Notes

  • NOT for Morizo Edition or vehicles produced after March 2025.

  • The error canceller is required for proper operation without triggering fault codes.