Active Autowerke Aflow Catted Downpipe - A90 | A91 Supra (B58)

Unleash the full potential of your Toyota GR Supra A90 / A91 with the Active Autowerke B58 Aflow Catted Downpipe, precision-engineered to maximize exhaust flow, cut turbo lag, and deliver a deeper, more aggressive tone at a lower entry point than the GESI version. This downpipe replaces the restrictive factory unit with 4.5” mandrel-bent stainless piping that tapers to 3.5” through an integrated flex joint before meeting the OEM 80mm exhaust connection. The diameter never drops below stock at any point in the path, so exhaust gas evacuates faster, spool times shorten, and throttle response sharpens. A 4.5” Active Aflow Super High Output catalytic converter handles emissions duty, built with full 304 stainless steel construction including the substrate, and carrying a 400 cell per square inch ultra high-flow catalyst. It is EPA registered, compliant in 49 states, fully OBD2 compliant, and will not produce a CEL for catalytic efficiency. The downpipe itself is constructed entirely from 304 stainless steel with 1.5mm wall thickness and TIG-welded throughout, built in Miami, Florida. Key Features No CEL for catalytic efficiency 4.5” Active Aflow Super High Output catalytic converter, EPA registered and OBD2 compliant in 49 states Full 304 stainless steel cat construction including the substrate 400 cpsi ultra high-flow substrate Rated for up to 800 HP applications 4.5” mandrel-bent piping tapering to 3.5”, meeting the OEM 80mm connection Never drops below the stock 80mm diameter Integrated stainless flex joint 304 stainless steel with 1.5mm wall thickness, TIG-welded construction Quicker turbo spool and improved throttle response Direct bolt-on installation, no cutting or welding Made in Miami, Florida 5-Year / 50,000-Mile Warranty on shell and tube ends, 2-Year / 25,000-Mile Warranty on catalytic core Vehicle Fitment Toyota GR Supra A90 / A91, 3.0L B58 turbocharged inline-six Performance Active Autowerke measured an increase of 18 whp on their Mustang chassis dyno using this catted downpipe together with the Active Autowerke Signature exhaust on the stock tune. Gains of 53 and 94 whp were recorded with their Stage 1 and Stage 2 tunes respectively, using the same downpipe and exhaust combination. Not legal for sale or use on pollution-controlled motor vehicles registered in California per California Vehicle Code sections 27156 and 38391. Warranty on the catalytic core is void if the vehicle produces burble or overrun fueling in excess of stock, which physically destroys the catalyst.