Bill: Change it. The DISA V. is a very important piece. Something is blocking your air intake. Sometime the DISA shows no signs of decay -- like mine, but when you change it -- your Bimmer will act like it's released from an ASTHMA Attack. I fill up on Saturday, runs errands over weekend, Drive 24 mi. each way to work now in two weeks without filling up. This is EXTRAORDINARY! The response now is HEAVEN. And my pockets are not SQUEALING anymore either...