Originally Posted by dinan540
If you want to free up more air flow, and you have a post-vanos 540 buy a 1997 540i intake manifold or a 1994-98 740i intake manifold. This works well if you have an engine modification chip. There is a rumor that the pre-vanos intake manifold is very similar in construction and engineering as the dinan intake manifold that sells for $1500 for the 540i.
96-98 intake runners would do. don't have to be 97's or Dinan's where they take the OE part and bore it out or take the 96-98 runners and stamp their name to give it the extra 2000% markup.