Yep, y-pipe on the smaller tube. It's one of many "prone to failure" parts on the X. When you get the new one you will be able to see the poor engineering/design of it and why it cracked on you. The rubber should have been molded in the shape of the bend, instead it was molded straight and becomes permanently stressed when you bend it to install it. Add a few heat/cold cycles to it and you've got crackola. Also, the rubber in the area of the bend is extremely thin. You'll need one of these every 50K miles. This is one of the many parts that were poorly designed originally and that BMW has neglected to redesign. But of course I can see their point of view why they wouldn't. They are making a ton of money off us on the repair/parts side. Also, you have to consider if there will be any long term engine damage done by this cracked part allowing dirt to be sucked right into your engine w/o the benefit of air filtering.

Every 3.0 on the road needs/has needed one or two of these . . . just part of the BMW ownership experience. If you own a 3.0 and haven't replaced it yet, you should because it is cracked.

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2010 Lexus RX350 still new
2003 BMW X5 3.0i w/sport package w/68K miles. (gone Thank God!)
2002 Dodge Ram 2500 4X4 cummins diesel w/198K miles, custom repo truck
2009 Scion tC w/46K miles
2007 Suzuki SV650 custom streetfighter
2000 Lexus GS400 w/165K miles