BMW N54 Downpipe Fix (RARE). Condition is New. Follow my thread for more details. {url removed} . This item is not street legal. This item is intended for temporary use only when troubleshooting your O2 sensors or when removing the ses light while setting the readiness monitors. This fix should not be used permanently. By purchasing this product you agree it will not be used to facilitate the removal or defeat of any emissions control systems. Follow the link for the install guide. {url removed} Don't be fooled by cheap parts and manufacturing techniques that can fry your ECU. This device is not meant to regain HP lost as other ads state with negative reviews. Any ad that misstates this information is simply not knowledgeable on how the N54 platform works. Not all units are created the same! Get the blue and blacks that have been proven to work and been in the market for a while...check my feedback.