I just noticed the very restrictive screens in the MAF of my 540i. It is a very common thing to remove the screens on a Z28 or Impala SS MAF and has been dyno proven time and time again to produce a 5hp gain at the rear wheels. Any of you performance guys tried this or heard of any dyno testing of this modification. I am going to try it out. I also put a K & N cone filter on the end of the MAF to try also until I get a pure cold air kit.