since, I'm very cautious about using a tubular manifold that will crack later on. Burnsstainless.com will be providing BTF 321 stainless steel to use for the manifold fabricating. 321 stainless steel tubing is one of the most desirable materials for exhaust systems because of its excellent resistance to fatigue and cracking at elevated temperatures. It is usually the material of choice for high temperature turbo applications.
On top of that, I talked to the manager/metallurgist of Nitrofreeze about having the 321 stainless steel manifold cryo-treated since I really want the BTF tubular manifold to last and not crack due to heat cycles.
Ryan told me that a 321 stainless steel is 17-19% carbon. It would benefit from cryo-treatment. the manifold will undergo stress relieving. This helps remove stresses that will develop intro cracks as the part ages. Retained austenite will convert to martensite making the manifold less susceptible to cracking.
So Nitrofreeze.com, one of my sponsors recommended to have my 321 tubular manifold, dp, and other hot parts be cryo-treated first.....before going to swaintech for ceramic coating.
COMPOUND TURBOS (GT2860r & GT4294r)
build, goal= 800hp
BTF, Nitrofreeze, Split Sec, Turbosmart, K1, Supertech, DDM, WERKS, Solo Performance, Aeroforce, Forgestar, Burns SS, TurboWerx