I think these are Hall big bore headers and pipes. I took them off my car when I purchased her 6 years ago as I prefer the the look of the Ansa exhaust. They are ceramic coated. Offers? Thanks, Shashi 
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Yes those do look like the Hall big bores. I have the same set.
I believe the headers are mind train and the exhaust is from Hall. The big bore headers have very small collectors. I have had both sets. I still have the headers that are pictured above. I gave the big bore exhaust away as I didn’t like the looks or how it fits on the car.
Are those O2 sensor ports on the header collectors, or something for a CA EGR system?
I believe that is a pan evacuation system that is used instead of PCV system. It only really works well at full throttle.
I agree, those pipes coming our of the collectors look like an Evacupan system. I had that set up on my race car years ago and it never did work right.