I am working on another custom exhaust and I have the following measurements.
The header terminates in a male tube 1.66-1.69" OD depending on where you measure it. I found 1.75" SS exhaust tubing 16g would be 1.75-(0.065*2) or 1.62" ID
1.75" 18g (0.049" wall) would be 1.652" theoretically.
I know I am going to need to massage this tubing slightly to make that joint a nice slip fit.
I've read some reviews of exhaust pipe expanders on Amazon etc and did not get a good feeling but I am only trying to get a little bit of diameter out of this tubing.
Suggestions including buying new tools or having a shop do it?