After 120k miles of normal EGR function and zero CCV filtering into the intake, then another 16k with a custom ECU flash & ProVent filter, this is the current condition of my intake 'manifold'. I removed the intake elbow so that I could see what head gasket I have, since I couldn't think of any better way. After seeing the crud built-up in the elbow, I stuffed a camera into the intake... not pretty. This is exactly what I expected to see, given the amount of exhaust smoke I get when I give her full throttle. Apparently the ProVent is doing its job because the crud is dry & powdery, not wet & oily. With all the top-end work I have planned in the near future, this engine should really pick up on efficiency & power after I get her all back together.
It also makes me wonder how many CRDs and other diesels were scrapped just because of the stupid EGR?