AMS Performance GR Supra B58 Street Downpipe w/GESI Catalytic Converter

Overview

Upgrade your exhaust system with the AMS Performance Street Downpipe, engineered specifically for the Toyota GR Supra A90/A91. Designed to improve exhaust flow while maintaining street usability, this high-quality downpipe enhances turbo performance, sound, and overall driving response.

• High-Flow GESI Catalytic Converter: Includes an EPA-verified Ultra High Flow GESI catalytic converter rated to support 800+ horsepower.
• 4.5” Mandrel-Bent Piping: Large-diameter, smooth-bent tubing reduces restriction and maintains optimal exhaust velocity.
• 304 Stainless Steel Construction: Heavy-gauge stainless steel provides durability, corrosion resistance, and long-term reliability.
• Precision CAD Engineering: Designed for OEM-level fitment with factory mounting points and flanges.
• Factory O₂ Sensor Retention: Integrated sensor bungs allow reuse of factory oxygen sensors without adapters.
• Stock & Aftermarket Exhaust Compatibility: 3.15” (80mm) outlet mates with factory or compatible cat-back systems.

• Improved Turbo Spool: Reduced back pressure helps the turbocharger spool faster for quicker boost response.
• Increased Power Potential: Enhanced exhaust flow supports horsepower gains when paired with proper tuning.
• More Aggressive Exhaust Tone: Produces a deeper, sportier sound under acceleration while remaining street-friendly.
• Emissions-Conscious Performance: High-flow catalytic converter balances performance and compliance in many U.S. states (check local regulations).
• Direct Bolt-On Installation: No cutting required for installs — engineered as a direct replacement for the factory downpipe.

** Not CARB Legal**