Hey guys. I wanted to update on what I found. This hose in my hand did go to engine dipstick tube. I had a heck of a time blowing this hose out. Turned out to be some plastic like a decal stuck in it. Also the tube going right into the dipstick was plugged. I pulled out the entire dipstick tube and cleaned/freed up the tube.

I have it all back together and still fighting a lean condition on both banks. I replaced the vacuum hoses on the back side of the intake and at the valve on the front of the exhaust manifold. I also replaced the hose going to the firewall.

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2001 X5 3.0