I had these cut when I was working on connecting the long tube Stahl headers to the Ireland Engineering catback exhaust in my car. They are 3/8" thick 304SS and the internal diameter is 1"5/8" which is about the same of the stock exhaust (about 41 mm's). I also have a stock one that I bought on Ebay thinking that it would fit but it's smaller, maybe for the B33 engine? Not sure. Anyway, I'd like to at least recover some of the expense so you can have all three of them for $60 (I paid $200 for 3 1-3/4" that already used and these two so about $40 ea.).