The swirl flaps change the air flow into the cylinder for more efficiency. See here: -
BMW diesel engine "SWIRL FLAPS" all you ever ever need to know about Swirl flaps!
This article states that E53 with M57 variant do have swirl flaps but note what I said earlier about this. eBay vendors of don't usually list the 160kW M57TUD30 E53 as applicable for their kits.
Vanos? Nope, not on the M57D30/M57TUD30.