HKS 31021-AT011 Legamax Cat-Back Exhaust System

The HKS 31021-AT011 Legamax Exhaust System is a premium performance cat-back exhaust engineered by HKS — one of Japan's most respected names in automotive performance. Built as a direct-fit replacement for the factory exhaust, this system is designed to reduce exhaust backpressure, improve exhaust flow, and deliver a more engaging exhaust note without sacrificing everyday drivability.

Key Features:

• SUS304 Stainless Steel Construction — High-grade polished stainless steel piping provides superior corrosion resistance and long-term durability
• Application-Specific Muffler Design — Muffler shape and pipe diameter are engineered to the specific application to preserve low-end torque while maximizing high-end horsepower
• Reduced Backpressure — Optimized straight-flow internal structure improves exhaust gas scavenging for increased power output across the RPM range
• Premium Titanium-Style Exhaust Tips — Bold, large-diameter tips give the rear of the vehicle a distinctly sporty and aggressive appearance
• OEM Hanger Locations — Designed to bolt directly onto factory mounting points for a clean, rattle-free installation
• Includes Gaskets and Hardware — All necessary installation hardware is included for a complete bolt-on fit
• HKS Engraved Branding — Laser-engraved HKS logo on brackets and tips for a premium, finished appearance

The HKS Legamax line strikes a careful balance between performance and refinement, making it well-suited for enthusiasts who want a noticeable improvement in sound and power without an overly aggressive or intrusive exhaust note. As part of the AT-series Toyota application lineup, the 31021-AT011 follows HKS's rigorous engineering standards for direct OEM fitment compatibility and emissions equipment integrity.