N47 engine inlet manifold, N47D20A 2007-2009 ,and some later years with same engine code, don't have option to blank removed swirl flaps! Only one small part needed, when swirl flap shaft is removed, need to block one small hole .swirl flaps must be removed only ,thats all .its completely different mechanism as was in early M47 or M57 engines .if have never done this job , be very careful ,not fully removed all parts might do same engine damage , and its really not easy to do job .
Later N47D20C engines has swirl flaps fitted in inlet manifold gasket - spacer, so these can be bought new from BMW for about 50e or so .