I wish this was my truck. It belongs to a friend of mine. Yes the intake plumbing is 3" copper TIG welded together. The cooling lines for the air compressor and the air compressor pressure lines are also copper.
Other updates: Rear disc brake conversion using stock parts, It was too easy. Also are fabricating brake and fuel lines and mounts. And fabricating brake and clutch petals and their associated parts.
Phill