just to let you know, these are equivalent to Picco tuned pipe, part No. 7000 . Originally manufactured (late 1980's) for Picco P67 marine. I have, both, an original Picco No. 7000 P67 pipe (I purchased back in 1989), and one of these new (black coated) Picco pipes, I purchased from Derek. They are equal in dimensions (I have measurements too).