Active Autowerke - Downpipes w/ GESI G-Sport Cats || S55 (M2C/M3/M4)

Active Autowerke F8X High-Flow Catted Downpipes – GESI Gen 2 (F87 M2C, F80 M3, F82 M4)

For over 30 years, Active Autowerke has led the way in BMW performance innovation. Their latest release—High-Flow Catted Downpipes for the F87 M2 Competition, F80 M3, and F82 M4—is a true representation of that legacy, offering noticeable performance gains, emissions compliance, and precision fitment.

This version includes ultra high-flow GESI Gen 2 catalytic converters (4" diameter, EPA registered) that are OBD2 compliant and WILL NOT trigger a CEL (Check Engine Light), making it a top-tier solution for daily-driven and tuned vehicles alike.

Key Features:

• No CEL – GESI Gen 2 advanced catalysts eliminate Check Engine Lights

• Ultra High-Flow 400 CPSI Catalyst – Reduces back pressure while increasing performance

• OBD2 Compliant – Safe for use on 1996+ vehicles in 49 states (Not CARB legal)

• Quicker Turbo Spool – Reduces lag and improves throttle response

• Improved Powerband – Boosts low-end, mid-range, and high-end power

• Durable Construction – Made from TIG-welded 304 stainless steel with casted stainless V-band upper for OEM-like fitment

• Withstands Extreme Temperatures – Operational efficiency reached in under 9 seconds, withstands up to 1500°F

• Direct Bolt-On Fitment – No cutting or welding required; accepts OEM O2 sensor heat shields

GESI Converter Highlights:

• Made from furnace-braised 304 stainless steel substrate

• Proprietary precious metal loading technology minimizes emissions and CELs

• Designed for engines making 500–850 HP

• Ideal for forced induction setups

• Covered by 5-Year / 50,000-Mile Shell Warranty and 2-Year / 25,000-Mile Core Warranty

• Made in the USA – Miami, Florida

⚠️ NOTE: Not CARB compliant. Not for use on vehicles registered in California.
⚠️ Federal Emissions Disclaimer: In accordance with EPA guidelines, these converters are legal under Mobile Source Enforcement Memorandum 1A, provided they do not adversely affect emissions.

Fitment Applications:

• BMW F87 M2 Competition

• BMW F80 M3

• BMW F82 M4