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Active Autowerke F8x M2 Comp / M3 / M4 High Flow Catted Downpipes

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Active Autowerke F8x M2 Comp / M3 / M4 High Flow Catted Downpipes

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The F8X downpipes are strategically engineered to virtually eliminate the immensely restrictive characteristics of the factory F87 M2C, F80 M3 and F82 M4 downpipes – therefore reducing radiant heat and increasing performance. The initial prototype design didn’t include the flex joints you see in the images above. Without these flex joints, the prototypes created an annoying vibration from within the cabin. AA quickly realized the necessity of including flex joints into the design and went back to the drawing board. The works of art you see above are a culmination of years of experience engineering top-notch BMW exhaust products. Made from 1.3-1.5mm thick 304 stainless steel.

Developed for precise fitment on both the F87 M2C, F80 M3 and F82 BMW M4, the difference in performance will be noticeable the moment you leave your driveway!


Quicker turbo response, less restrictive, more free flowing Improved low-end and mid-range performance, and lighter weight than factory downpipes.

The GESI G-Sport High Output Catalytic Converter features full 304 stainless steel construction, including the substrate. GESI HO-Series Gen 2 Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant, perfect for use on 1996 and newer vehicles. GESI proprietary precious metal loading technology ensures greatly reduced emissions, eliminating most "Check Engine Lights". These ultra high flow catalytic converters outperform stock converters and provide a reliable solution to the most common catalytic converter problems. The GESI HO-Series Catalytic Converters are rated for engines putting out between 500 and 850 horsepower while maintaining a high flow capacity. The reduced back-pressure from this ultra high flow catalytic converter will allow you to maximize your engines horsepower without the harmful emissions. Say goodbye to Check Engine Lights and failed emissions tests!

Please Note: These catalytic converters are not legal for use on vehicles registered in the state of California as a result of California Vehicle Code Section 27156 and 38391. Federal law prohibits the tampering of an emissions control device. Mobile Source Enforcement Memorandum 1A, allows for aftermarket parts to be used in the repair or replacement of emissions control systems, provided the emissions are not adversely affected. There is no mention or reference to cell density or converter volume dimension. The GESI catalytic converter will produce emissions that will meet the standards set by the EPA, not CARB.


  • -NO CEL for catalytic efficiency when using this downpipe

  • -Quicker turbo spool and response

  • -Less restrictive, more free flowing

  • -Improved low end and mid range performance as well as higher boost levels

  • -GESI EPA registered high flow and fully OBD2 compliant

  • -Casted upper stainless steel V-Band for precise fitment

  • -Withstands up to 1500F

  • -Can reach operational efficiency within 9 seconds of startup

  • -Easily bolts-on with 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



Please contact us if you have any questions.

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