We highly recommend changing the tensioner chain guide rail when removing the vanos, the stock chain guide becomes brittle over time and if left unchecked it can eventually break, causing chain noise (sometimes confused with vanos rattle) at low RPM.
It's also very easy to replace once the vanos is out of the way.
We sell the stock BMW replacement guide as well as an upgraded version that is CNC machined from solid stock and will last the life of the engine.
