The value for money clean air device with a sporty sound high performance air filter with internal screen for high grade motor protection 3 round adapter rings allow the connection diameter to be reduced from 90 to 80 70 and 60 mm with tv partial certification according to s193 of the german licensing regulations a square adapter is available for vehicles with bosch l jetronic the universal holder kit is recommended for mounting the filter the filter can be cleaned and reused with th