I want to build a header possibly for a turbo what wall thickness should I use I have access to tube thickness schedule 5 and 10 and does anyone know what pipe size turbo xs uses tube is 3" outside diameter and schedule 5 and 10 are 3" inside diameter and also is there a place I can source a flange for the motor side and midpipe side if not ill have a machine shop make me one

 

The thread below might be a good place to start.

https://www.rx8club.com/series-i-major-horsepower-upgrades-93/building-custom-turbo-rx-8-a-46776/

 

i have an idea, pm'd.

 

MazdaTrix sells a manifold flange for building a header.

And next time please try typing in complete sentences.

 

Would .065 wall be sufficient for the header