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

OVERVIEW

The "downpipe and tune" is the single most effective bolt-on for the B58 GR Supra, and the AMS Performance Street Downpipe delivers it while staying street-legal. A 4.5″ full mandrel-bent stainless steel design with a 49-state-legal high-flow GESI catalytic converter, it dramatically lowers back pressure so exhaust gas flows more easily across the turbine wheel — power comes in earlier and spool improves — all with a throaty note and OEM-level fitment. Bolts to the factory location with no cutting.

SPECS

• 304 stainless steel, 4.5″ design reducing to a 3.5″ flex section for maximum volume and flow
• 49-state-legal high-flow GESI catalytic converter rated to 800+ HP
• Newly formulated cat substrate for modern emissions requirements
• 3.15″ (80mm) outlet — works with stock or aftermarket cat-back systems
• Turbine flange with smooth transition from the turbine outlet
• Threaded O2 bungs in OEM locations — no jumpers needed
• Mandrel-bent tubing; complete bolt-on, no cutting

PARTS INCLUDED

• Fully stainless steel street downpipe with EPA-compliant GESI catalytic converter
• Adjustable mounting bracket
• Detailed installation instructions

TECH RESOURCES

• Recommended companions: AMS 3″ Charge Pipe and AMS Intake Manifold. Prefer a catless race version? See our AMS GR Supra Race Downpipe.
• A supporting ECU tune is recommended to realize the gains.
• Install instructions (PDF): AMS Supra Downpipe Install Guide
• Install/overview video: AMS Supra Street Downpipe (YouTube)

PART NUMBER

• AMS.38.05.0001-2

VEHICLE APPLICATIONS

USDM models only; does not fit world-market vehicles. Not available for sale on emissions-controlled vehicles in California without a completed AMS Race Waiver.