Active Autowerke F8x M3/M4 S55 Catless Downpipes (For Offroad/Race Use)

These F8X downpipes are strategically engineered to virtually eliminate the immensely restrictive characteristics of the factory F80 M3 and F82 M4 downpipes – therefore reducing radiant heat and increasing performance. Our 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. We 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, our F80 M3 and F82 M4 downpipes can also be finished with a performance-enhancing. Developed for precise fitment on both the F80 BMW M3 and F82 BMW M4, the difference in performance will be noticeable the moment you leave your driveway! Attention: For Off-Road or Race Use Only! Features: 10-15 HP increase* Flex joints to dampen vibration 304-stainless Quicker turbo response Less restrictive, more free flowing Improved low-end and mid-range performance Lighter weight than factory downpipes Vehicle Fitment: 2014 Bmw F80 M3 2015 Bmw F80 M3  2016 Bmw F80 M3 2017 Bmw F80 M3 2018 Bmw F80 M3 2019 Bmw F80 M3 2014 Bmw F82/F83 M4 2015 Bmw F82/F83 M4 2016 Bmw F82/F83  M4 2017 Bmw F82/F83 M4 2018 Bmw F82/F83 M4 2019 Bmw F82/F83 M4 2020 Bmw F82/F83  M4