the E53/N62 did not have the secondary air like the same motor in the sedan. I don't know why, but they didn't. I replaced an engine with one that came out of a sedan. There was a threaded plug in the original motor and I took those out and put into the new(sedan) engine. Was very simple and easy. The motor will run fine without SAS.

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600