Guys, I've been exchanging emails with Daniel at Mazzuri since Thursday. I was supposed to stop by Friday afternoon, but I got stuck at work until 5:30. I'll be dropping by tomorrow afternoon after 3, and I'll post up anything Daniel has to say about the build-up.
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Okay, I stopped by Daniel's shop this afternoon, and after taking a look at the engine, he says replacement headers are definitely possible. He mentioned that the spacing is not as bad as he thought, so he's got a little room to work with. He also said that the stock exhaust manifold leaves a lot of room for improvement, so that's good news. His next step is to rent an IS350 to start development on the actual headers. I'll post if/when I hear more.