[enemigo13]

as B58 PCV is often a problem and OEM valve cover is not cheap, I understand that some people (including me) are tempted to find cheaper alternatives. This is my experience with febi valve cover (fcp euro is also selling it https://www.fcpeuro.com/products/bmw...bi-11127645173)

attaching photos, headports side exploded from the boost (was running 1.7bar of boost). OEM has these PCV parts sonic welded, febi has them on glue. Do not ever use febi valve cover unless you're running stock boost (not sure if/how long it is reliable with stock boost though). After just 2 or 3 WOT pulls car started to smoke like train and power was lost. After few minutes cylinder 6 went south and came back after injector change, so oil fu*ed up injector. When febi valve cover was shot boost through headports went directly into valve cover making lots of mess. There are lot's of 3rd party manufacturers who make them (e.g. metzger), febi looked like reliable one, but obviously it is not.