30-09-2019, 08:33 AM
Derek is correct, it is technically illegal I understand to make an exhaust pipe from copper. I ran a huge copper bunchonanas on my Nippy for years and must have killed thousands. I suspect it's theoretically true under lab conditions but once it's coated in soot the copper never touches exhaust gas. (Much like aluminium corrosion). For an inlet I can't see why not, unless charge heating is an issue.