Experience the pinnacle of exhaust performance with the AMS Performance Toyota GR Supra Street Downpipe featuring a high-flow GESi catalytic converter.

Our 4.5" full mandrel bent downpipe is unmatched in both performance and durability. It ushers in power earlier and significantly improves turbo spool-up. The secret lies in the long, gradual transitions within the mandrel bent pipe, ensuring exhaust gasses maintain velocity without creating back pressure.

What sets us apart is our superior engineering. We've designed a product that maximizes power potential while adhering to stringent emissions requirements. The catalyst boasts a specially formulated substrate tailored for modern vehicle emissions standards, ensuring it's not just an off-the-shelf solution.


  • Substantially reduced back pressure means more power potential.
  • Effortless exhaust gas flow across the turbine wheel.
  • 49 State Legal High Flow GESI Catalytic Converter, rated for over 800 horsepower.
  • Newly formulated substrate to meet modern emissions standards.
  • Delivers a throaty exhaust note under wide-open throttle.
  • CAD-engineered for maximum exhaust flow with a flawless fit and finish.
  • Crafted from 304 stainless steel with a 4.5" design that reduces to a 3.5" flex section, optimizing volume and flow.
  • Smooth transition from the turbine outlet thanks to the turbine flange.
  • 3.15" (80mm) outlet accommodates both stock and aftermarket catback systems.
  • Fully bolt-on installation; no cutting required - attaches to the factory location.
  • O2 sensors in OEM locations; no jumpers needed.
  • Mandrel bent tubing for the ultimate flow.


  • 2020 Toyota GR Supra with B58 3.0L Turbo Engine (LHD and RHD).
  • 2021 Toyota GR Supra with B58H 3.0L Turbo Engine (USDM models only).

Kit Includes:

  • Fully Stainless Steel Supra Street Downpipe with EPA Compliant GESI Catalytic Converter.
  • Adjustable Mounting Bracket.

Elevate your Supra's performance and sound while staying emissions-compliant with the AMS Performance Street Downpipe. Unleash the true potential of your engine.