For some reason, I’m pondering this motor again...There are some things I’m trying to figure out from an engineering standpoint, and some other stuff.

First off, I couldn’t find an answer or understand this, but what is the point of a “headifold”, combining the cylinder head and exhaust manifold into one unit? What are the benefits of doing so, and is that why 4pot EB motors sound the way they do compared to “traditional” turbo 4pots?

And for that matter, what exactly is that difference in noise? Take a GTI and EB for example: