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.

Description

Additional Info

Shipping policy

BP PRICING DIFFERENCE

Reviews

Product Inquiry

Description

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
Fits both left and right hand drive A90/A91 GR Supra

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.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

Reviews

Product Inquiry

First Name (*required)

Last Name (*required)

Your E-Mail (*required)

Telephone Number (*required)

Country (*required)

Vehicle Year / Make / Model (*required)

Please Explain What do you want to do with your vehicle

Additional Information (optional)

I agree to the terms & conditions and privacy policy and to have Bulletproof Automotive LLC contact me for promotion, marketing and other purposes via email, phone or SMS message.