AMS Performance Street Downpipe w/ Catalytic Converter for A90 / A91 Toyota GR Supra

Original price was: $1,489.95.Current price is: $1,445.25.


Street Downpipe with Catalytic Converter

2020+ Toyota GR Supra

STOCK STATUS: 10 in stock
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SKU: AMS.38.05.0001-2 Category: Vehicle: Brand:
This item and any similar items are not CARB approved and therefore not for sale in the state of California or other states that require CARB certification. No assessment is being made regarding this product's compliance with the EPA's anti tampering policy, only that the necessary testing and validation has not been completed. Please check with your local enforcement officials regarding legality of use in your place of residence.
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AMS Performance Street Downpipe w/ Catalytic Converter for A90 Toyota GR Supra

The top-performing and highly durable downpipe on the market is the 4.5″ full mandrel bent version. It brings power in earlier and greatly enhances turbo spool-up. The mandrel bent pipe’s extended and smooth transitions enable exhaust gases to maintain velocity, preventing any accumulation of back pressure in the system. AMS has developed an exceptional product thanks to our superior engineering expertise. Additionally, the catalyst in this downpipe features a specially formulated substrate with a specific wash to meet the latest emissions standards for new vehicles. It is not a generic catalytic converter found off the shelf.

First in Class Durability and Performance

  • At its core, AMS is an engineering company that prioritizes excellence. To achieve optimal exhaust flow, the AMS Engineering team utilized Solidworks, a 3D software, to meticulously design the inlet and outlets of the AMS MKV Supra Downpipe. To maximize heat retention within the downpipe, heavy gauge stainless steel was employed. The Engineers at AMS even utilized 3D printing technology to ensure a precise fit that matches OEM standards. The inclusion of threaded O2 sensor bungs allows for the use of factory O2 sensors. Unlike some alternative options in the market, AMS downpipes outperform them and are not susceptible to cracking. In addition to enhanced performance, AMS’ Engineering Team has also crafted a product that produces a superior sound quality.


  • Significantly Lower Back Pressure Means the Potential for More Power.
  • Exhaust Gas Can More Easily Flow Across the Turbine Wheel.
  • 49 State Legal High Flow GESI Catalytic Converter Rated to Over 800 Horsepower.
  • Newly Formulated Substrate for New Vehicle Emissions Requirements.
  • Throaty Exhaust Note Under Wide Open Throttle.
  • CAD Engineered for Maximum Exhaust Flow with Unrivaled Fit and Finish.
  • 304 Stainless Steel 4.5” Design Reduces to a 3.5” Flex Section, Maximizing Volume and Flow.
  • Turbine Flange Offers a Smooth Transition from the Turbine Outlet.
  • 3.15” (80mm) Outlet Allows You to Run Either Stock or Aftermarket Cat Back Systems.
  • Complete Bolt on Means No Cutting – Bolts to the Factory Location.
  • O2 Sensors in OEM Locations. No Jumpers Needed.
  • Mandrel Bent Tubing for the Best Flow.

Kit Contents

  • Fully Stainless Steel Supra Street Downpipe w/ EPA Compliant GESI Catalytic Converter
  • Adjustable Mounting Bracket
  • Detailed Installation Instructions


  • 2020+ Toyota GR Supra – A90 /A91 | MK5
  • Fits LHD and RHD


  • While AMS believes this product is either CARB EO exemption applicable, or complies with the EPA’s Anti-Tampering Policy, they have not completed the required testing and administrative process at this time. This product is not available to purchase for emissions-controlled vehicles located within the state of California, or available to ship to California addresses, without a completed AMS Race Waiver form. International users outside of the United States should act in accordance with their local laws and regulations.

About AMS Performance

AMS Performance is founded on principles of integrity and is dedicated to automotive performance, particularly for turbocharged vehicles. As a leading manufacturer of automotive performance parts, AMS not only offers a wide range of high-quality components but also provides additional services such as in-house engine computer calibration, parts and package installations, and engine and transmission building.

At AMS, their primary focus lies in engineering. Unlike other shops, they prioritize the development of components that deliver unparalleled performance. Their approach goes beyond a basic understanding of engine performance, utilizing computer-aided designs and employing mechanical engineers with extensive experience in the motorsports field.

With a history spanning two decades, AMS Performance has consistently maintained its position at the forefront of the industry. Whether you seek complete turn-key packages or individual components, AMS has the expertise to meet and surpass various performance goals. From drag racing to road racing and everything in between, AMS is ready to enhance your driving experience and elevate your vehicle’s performance to new heights.

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