ya - that is it, the secondary air line. What a PITA - I finally got it back in the hole after messing with it for more than an hour. I got the nut snug and best I can tell it's all sealed up, but guess I won't know for sure until I fire the bad-boy back up!

I don't know what the problem was, must have tweaked it just a bit because it was just not lining up right but I was able to get it close and then pushed the tube by hand to slip into the hole. Not a fun item to play with - I'm so glad they put that sucker right in front of the water pump......

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2003 4.6is - SOLD
2003 M5 Imola
2008 Mini Cooper S
2011 Mazda CX9