This might be an issue of US versus non-US cars. I have a 2001 S and replaced my headers with stainless Cargraphic ones. There are definately only two cats and O2 sensors on my car and the header dos not have the pre-cat pictured in the other post. It looked the same as panameras. I still have the old headers at the back of the garage and will post a picture later tonight.
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