Checked with the SA at the dealer today and asked about the lifters. They had arrived from Germany in two days which I thought was fantastic shipping time. The SA told me that she thought the new lifters were a newly engineered product, not simply a replacement for worn lifters. She also said that there is a new TSB out about the lifter noise and they have done two cars before mine and have had good results. I am looking forward to getting my car back with a new VANOS and new lifters. It should run better than new now. I also asked about Nitrogen for the tires and she told me that BMW doesn't think Nitrogen is worth it and they do not have the ability to change the air in the tires there however one of the dealerships in their group does but she said don't waste my money.
K4RPS 2008 135i. Z4 gone but not forgotten