You don't need to remove the intake manifold to either replace or clean out the pipe.
You remove the pipe where it connects at the egr valve.
If you "disable" the egr valve, you will get a Check Engine Light.
The best way to disable it is to put a "BB" in the vacum line.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".