Active Autowerke BMW S63 GESI G-Sport Cat Downpipes F90 M5 F91 F92 F93 M8

Recent addition to our BMW F90 M5 and F91/F92/F93 M8 collection, the Active Autowerke BMW S63 GESI G-Sport Cat Downpipes, is designed to eliminate factory exhaust restrictions, reduce radiant heat, and significantly increase horsepower and torque throughout the powerband. With optimized exhaust flow, these high-performance downpipes also reduce turbo lag, ensuring quicker throttle response, faster acceleration, and improved overall driving dynamics.

Manufactured in-house using premium 304 stainless steel, each set of F90 M5 and F91/F92/F93 M8 downpipes is precision TIG-welded and meticulously inspected for perfect fitment and durability. Designed with a factory-matched 3.5-inch V-band inlet, tapering into a high-flow, mandrel-bent body, these downpipes ensure seamless integration with the stock exhaust system. Unlike many aftermarket options, our design includes the lower section commonly sold separately as a “mid-pipe”, offering a complete bolt-on solution. Additionally, these S63TU downpipes are engineered to retain the OEM O2 sensor heat shield, maintaining a stealth, factory-like appearance for those who prefer a sleeper look.

This variant features 4.5-inch ultra high-flow GESI G-Sport Ultra High Output (UHO) catalytic converters, engineered to eliminate Check Engine Lights (CELs) while ensuring high-performance exhaust flow. Constructed entirely from 304 stainless steel, including the substrate, these GESI catalytic converters use proprietary precious metal loading technology to significantly reduce emissions while maintaining a high-flow capacity.

Rated for engines producing between 500 and 850 horsepower, these high-performance catalytic converters effectively reduce back pressure, allowing for quicker turbo spool, increased power, and improved throttle response. Unlike restrictive stock catalytic converters, this upgrade ensures optimized exhaust flow for enhanced performance, efficiency, and an aggressive exhaust tone.

For BMW F90 M5 and F91/F92/F93 M8 owners looking to maximize the power and sound of their S63TU engine, the Active Autowerke BMW S63 GESI G-Sport Cat Downpipes provide the perfect balance of performance, sound refinement, and long-term durability. Say goodbye to Check Engine Lights and factory exhaust restrictions—unleash the true performance and exhilarating sound of your BMW M5 or M8 with this premium high-flow downpipe upgrade.

KEY FEATURES:

• NO CEL for catalytic efficiency when using this downpipe
• GESI EPA registered high flow and fully OBD2 compliant
• Casted upper stainless steel V-Band for precise fitment
• 4.50″ diameter piping allows for maximum power output
• Quicker turbo spool
• Rated for 500 to 850 hp applications
• Withstands up to 1500 F
• Can reach operational efficiency within 9 seconds of startup
• Easily bolts-on no cutting or welding required
• Accepts OEM O2 sensor heat shield
• Durable construction from TIG welded 304 stainless steel
• Precise fitment
• Ultra high flow 400 cell per square inch catalyst
• EPA compliant for use on OBD2 vehicles (1996 and newer) except in California
• 304 stainless steel substrate is furnace braised to the mantle for outstanding durability
• GESi proprietary precious metal loading technology ensures greatly reduced emissions
• Ideal for Forced Induction Applications with no loss of HP
• Both passengers and drivers are safe from harmful emissions and noise
• Covered by 5 Year / 50,000 Mile Warranty (on shell and tube ends) and 2 year / 25,000 Mile Warranty on the Catalytic core to original purchaser only – NOTE: warranty will be null and void if your car has excessive burble (greater than stock) as that physically destroys the catalytic core
• Made in Miami, Florida

APPLICATIONS

• 2017-2023 BMW M5 F90
• 2019- BMW M8 F91 F92 F93

NOTES:

Due to potential variations in exhaust system fitment, professional installation is recommended for optimal results.