Originally Posted by RPiM5
Also the titantium, while super strong and super light, is not the best metal for exhaust systems because it does not deal with heat well. Exhausts need to have flexibility of expanding and contracting in order to maximize air flow for heat disapation and power generation. That's why T-304 Stainless Steel is one of the best metals out there for exhausts and is RPi exclusively uses this type of metal.
Titanium is used extensively in jet engine parts. I don't see your argument here?