It's the backing plate at the rear of the intake manifold. Part #11-61-7-508-541. $79 from Pelican. When you get it, open the package and inspect it. there is a tiny hose fitting (standard vacuum hose size) that I discovered broken on mine when I went to install the new one. Luckily Pelican was super awesome and sent me a warranty replacement next day air!!

I did the oil separator, all the hoses, and the backing plate without removing the intake manifold. There's enough room to work, but its awkward. It would be easier with the manifold off. And if you take the manifold off, I'd go ahead and replace the valley pan gasket, and depending on mileage, maybe the waterpump...good excuse to replace as much stuff as possible while you're there.

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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i