AMS PERFORMANCE STREET DOWNPIPE FOR A90 / A91 TOYOTA GR SUPRA [AMS.38.05.0001-2]
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AMS Performance Street Downpipe for A90 / A91 Toyota GR Supra
Toyota GR Supra downpipe from AMS Performance is a 4.5-inch full mandrel-bent 304 stainless steel street downpipe for the A90 and A91 GR Supra (B58 3.0L I6 turbo, 2020-present), delivering earlier power delivery, significantly improved turbo spool, and reduced back pressure across the full RPM range. The AMS Toyota GR Supra downpipe is designed using SolidWorks 3D CAD software and 3D printing fitment verification to ensure a precise fit that matches OEM standards, including a turbine flange that transitions smoothly from the turbine outlet, threaded O2 sensor bungs in OEM locations (no jumpers needed), and a complete bolt-on installation with no cutting required. The 4.5-inch primary section reduces to a 3.5-inch flex section before exiting at a 3.15-inch (80mm) outlet, allowing compatibility with both stock and aftermarket cat-back systems. Heavy-gauge stainless steel construction maximizes heat retention within the downpipe, while smooth, gradual mandrel bends maintain exhaust gas velocity and minimize back pressure throughout the system.
Toyota GR Supra Downpipe: Catalyst and Emissions
- The AMS Toyota GR Supra downpipe includes a 49-state legal GESI high-flow catalytic converter rated to over 800 horsepower, formulated with a newly developed substrate designed to meet modern vehicle emissions requirements. This is not an off-the-shelf catalyst; AMS uses a specifically formulated wash coat to meet current emissions standards while delivering high-flow performance at power levels well beyond the factory B58 output. Note: This product is not available for purchase for emissions-controlled vehicles located in California or for shipment to California addresses without a completed AMS Race Waiver form.
Features
- 4.5″ primary section reduces to 3.5″ flex section 3.15″ (80mm) outlet
- 304 stainless steel heavy-gauge construction for maximum heat retention
- Full mandrel-bent tubing for optimal exhaust gas velocity and flow
- 49-state legal GESI high-flow catalytic converter rated to 800+ horsepower
- Newly formulated catalyst substrate for modern emissions requirements
- CAD engineered using Solidworks; fitment verified with 3D printing
- Turbine flange offers smooth transition from the turbine outlet
- Threaded O2 sensor bungs in OEM locations no jumpers needed
- Complete bolt-on installation no cutting, bolts to factory location
- Compatible with stock and aftermarket cat-back systems
- Throaty exhaust note under wide open throttle
What’s Included
- AMS Toyota GR Supra downpipe with EPA-compliant GESI catalytic converter
- Adjustable mounting bracket
- Detailed installation instructions
Applications
- Toyota GR Supra: A90, A91 | 2020-present
Notes
- Fits both left and right hand drive A90/A91 GR Supra models
- 49-state legal. Not available for emissions-controlled vehicles in California or for shipment to California addresses without a completed AMS Race Waiver form. International buyers should comply with local laws and regulations.
Frequently Asked Questions
- What power gains can I expect from the AMS Toyota GR Supra downpipe? The AMS Toyota GR Supra downpipe reduces back pressure and improves exhaust gas flow across the turbine wheel, delivering earlier power delivery and improved turbo spool versus the factory downpipe. The included GESI high-flow catalytic converter is rated to over 800 horsepower, providing headroom well beyond factory output and making this a practical upgrade for both mildly tuned and highly modified B58 builds.
- Is the AMS Toyota GR Supra downpipe legal in all states? The AMS Toyota GR Supra downpipe is 49-state legal. It is not available for purchase for emissions-controlled vehicles in California or for shipment to California addresses without a completed AMS Race Waiver form. International buyers should verify compliance with their local emissions regulations before ordering.
- Does the AMS Toyota GR Supra downpipe require any cutting or fabrication? No. The AMS Toyota GR Supra downpipe is a complete bolt-on installation that bolts directly to the factory location without cutting or permanent modification. O2 sensors install in OEM positions with no jumpers needed, and the adjustable mounting bracket and installation instructions are included.
- Will the AMS Toyota GR Supra downpipe work with my existing cat-back exhaust? Yes. The 3.15-inch (80mm) outlet on the AMS Toyota GR Supra downpipe is compatible with both the factory cat-back system and most aftermarket cat-back exhaust systems designed for the A90/A91 GR Supra.
- Does the AMS Toyota GR Supra downpipe fit both left and right hand drive Supra? Yes. The AMS Toyota GR Supra downpipe is confirmed fitment for both left and right hand drive A90 and A91 GR Supra models.
About AMS Performance
AMS Performance is an engineering-led manufacturer of high-performance automotive components, founded on principles of integrity and dedicated to extracting maximum performance from turbocharged vehicles. With two decades at the forefront of the industry, AMS combines computer-aided design, mechanical engineering expertise from motorsports backgrounds, and in-house services including engine calibration, installation, and engine building to deliver components that go beyond off-the-shelf solutions. Their catalog spans turbo kits, intercoolers, downpipes, intakes, and complete turn-key packages for drag racing, road racing, and high-performance street applications.
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We want you to feel confident before making your purchase. Here are a few important details to help you better understand this product and how it fits into your space.
- Please review the product dimensions carefully to ensure the right fit for your space
- Color may vary slightly due to lighting and screen settings
- Materials and finishes are selected for both durability and visual appeal
- Some items may require simple assembly upon delivery
- Perfect for both everyday use and long-term comfort
If you have any questions about this product, feel free to reach out to our support team. We're here to help you make the right choice.
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Product Size Guide
Please refer to the general size reference below to better understand how this product may fit into your space. Dimensions may vary slightly depending on the design and materials.
| Category | Small | Medium | Large |
|---|---|---|---|
| Decor & Accessories | Up to 10″ | 10″ – 20″ | 20″+ |
| Tables | Up to 30″ | 30″ – 60″ | 60″+ |
| Seating | 1 Seater | 2–3 Seater | 4+ Seater |
| Storage Units | Compact | Standard | Large Capacity |
| Lighting | Small Fixture | Standard Fixture | Large Fixture |
Note: For exact product dimensions, please refer to the specifications section above. This guide is intended as a general reference only.
AMS PERFORMANCE STREET DOWNPIPE FOR A90 / A91 TOYOTA GR SUPRA [AMS.38.05.0001-2]
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