That a great question Larry, I do not know the origins of the headers on my car but I believe they are original to the replica which was built by a company called Marauder. I believe they are close to the Pantera design and fitment. The chassis layout is mid-engined and very similar to the Pantera.
The dimensions can be seen in the photo below but they are approximately 14" tall and 17" long. I expect that I will have to pay a local exhaust shop to modify the exhaust to fit any new headers I purchase. I am also considering the possibility of having the current headers modified to match the 4V ports, but they are old and corroded. removing the rust and repainting them is actually how I discovered this issue.
