I've got a project car, where I'm putting a 4.2-liter BBD engine in a 2007 Porsche Cayman S. I'm fabricating the exhaust for it, using the stock exhaust manifolds. The problem I'm having is finding a way to hook up to the pipes to those manifolds.

I found the whole front pipe (including cat) on O'Reilly, and the front part looks like this:

Manifold Flanges.jpg

Any ideas on where I could get two flanges like this in stainless, or better yet, the flanges and the first few inches of the pipes?