I know that most people use thick material (mostly 304 or 321) for theire turbomanifolds.
But what do you suggest for N/Amanifolds. I think they can be made of thinner materials. What thickness do you prefer (if possible in inch, so that I can calculate it to our mm-system) or suggest? Is 304 a good choise?

Thanks

 

304 is a common material for both because of its strength and is fairly inexpensive. 16 gauge seems to be the most common available (1.61mm) but 18 gauge (1.31mm) is probably a better choice for a normally aspirated header.

 

Thanks. That´s what I wanted to know.
Can you explain what gauges means? Or how is is calculated in mm.
I often read gauges but I do not know how to calculte it into our mm-system.

 

We use either 304 Stainless in .065" or .049 sometimes .035 (16g 18g 20g) G= gage

or 321 in a .049" or .035" ( 18g and 20g) Thickness

or Inconel 625 in .035 and .028 (20 and 22g)

 

16 ga is usually enough for turbo when built properly...