This Filter Features DNA®’s Advanced Fcd (Full Contour Design). Installation Of This DNA Air Filter Is Very Easy; Simply Follow The Installation Instructions Included In The Bmw Workshop Manual. The Filtering Efficiency Is Extremely High At 98-99% Filtering Efficiency (Iso 5011), With 4 Layers Of DNA® Cotton. The Flow Of This DNA Filters’ Set Is +22.35% More Than The Stock Filters’! These DNA® Filters Are Designed As High Flow Air Filters For:’Road Use’. BMW: 20-21 R 18 1800cc. We will accept your request at our earliest opportunity. This includes Republic Of Ireland. Please do not ask us to lower the value of goods this is illegal and we do not want to get involved in this kind of activity.