Active Autowerke GESI Catted Downpipe BMW G87 M2 / G80 M3 / G82 M4

Unlock more of the S58’s performance and sound potential with the Active Autowerke Signature GESI Catted Downpipes. The restrictive factory downpipes create unnecessary backpressure immediately after the turbochargers, while Active Autowerke’s 3-inch high-flow design helps exhaust gases evacuate more efficiently for quicker turbo spool, sharper response, and increased power potential. At the heart of the system are oversized 4.5-inch GESI G-Sport Ultra High Output catalytic converters, providing exceptional flow while remaining fully OBD2 compliant and engineered specifically to prevent catalyst-efficiency check engine lights. Each catalyst is rated to support 500–850 horsepower, making these downpipes equally suitable for a lightly modified street car or a higher-output tuned S58 build. Best of all, no performance tune is required, making this an excellent choice for owners who want the performance and sound benefits of upgraded downpipes without the CEL concerns commonly associated with lower-quality high-flow cats. Fitment Notes Fits 2023+ BMW M2 Coupe (G87) Fits 2021+ BMW M3 Sedan (G80) Fits 2021+ BMW M4 Coupe (G82) Designed for vehicles equipped with the S58 twin-turbocharged engine Direct bolt-on installation with no cutting or welding required Connects to the factory exhaust using a 70mm outlet, maintaining at least the factory tubing diameter throughout the system Compatible with Active Autowerke G8X exhaust components No performance tune required Designed to operate without a catalyst-efficiency check engine light GESI catalysts are EPA registered and compliant for OBD2 vehicles in 49 states; not CARB compliant for California use Included Driver-side Active Autowerke catted downpipe Passenger-side Active Autowerke catted downpipe Integrated GESI G-Sport Ultra High Output catalytic converters Stainless steel flex joints Cast stainless steel upper V-band connections Product Specs Active Autowerke SKU: 11-085 Primary Tubing Diameter: 3 inches Exhaust Outlet Diameter: 70mm Catalyst Diameter: 4.5 inches Catalyst Density: 400 CPSI Catalyst Type: GESI G-Sport Ultra High Output Catalyst Power Rating: 500–850 HP per catalyst Maximum Rated Temperature: 1,500°F Catalyst Light-Off: capable of reaching operational efficiency within approximately 9 seconds Downpipe Material: 304 stainless steel Catalyst Construction: 304 stainless steel shell and substrate Tubing Wall Thickness: 1.5mm Construction: TIG welded Made in Miami, Florida GESI catalyst shell/tube-end warranty: 5 years / 50,000 miles GESI catalytic core warranty: 2 years / 25,000 miles for the original purchaser Excessive aftermarket burble programming can damage the catalytic cores and void catalyst warranty coverage Product Features 3-inch high-flow downpipes reduce post-turbo backpressure for quicker spool, improved response, and greater horsepower and torque potential Premium 4.5-inch GESI catalysts combine excellent exhaust flow with proper emissions treatment and OBD2 functionality Engineered specifically for no catalyst-efficiency CEL, eliminating one of the biggest compromises associated with typical aftermarket catted downpipes Each catalyst supports 500–850 HP, providing plenty of headroom for modified and tuned S58 applications Full 304 stainless steel construction, TIG welding, stainless flex joints, and cast V-band connections provide exceptional durability and precise fitment No performance tune required, making these an excellent standalone upgrade or foundation for a complete G8X exhaust and performance package