Arizona

Neither have I. So shot SFP an email about it.

GRIFFIN TT

ebay mani's are made out of 304 stainless.
Most of SFP manifolds are made out of mild steel then coated, unless they recently changed.
I wont be surprised if they lie about it...lol. But yeah there are MANY company's that make manifolds out of mild steel. But the mild steel is not whats bad about it, its just there welding and design process. They dont allow enough room for thermal expansion. BTW Stainless exhibits more thermal expansion then mild steel so if its not properly designed it will crack, contrary to popular belief. Mild steel has less expansion and is less proned to cracking. But if somebody doesnt know what they are doing they dan mess that up too.

You can take my advise if you like or just ignore and buy a POS manifold your choice. Remeber I am not talking from what I heard like what most people do on the internet. I have actuall experience with there products. Take it as you wish

GRIFFIN TT

on a side note,
the strongest manifolds are made of forged mild steel weld-els
If welded correctly they will never crack. The thermal expansion properties are very forgiving of that particular material..
BTW I worked in a shop that designed and fabricated manifolds. We dealt with many types of materials ranging from titanium and inconel to mild steel. So I have some experience with the subject. SFP is a rip off

qtb33

The main problem with using mild steel other than it is corrosion prone is that it dosn't retain alot of strength when it gets to higher temps such as 1200-1400 degrees F. While metals such as 321SS and inconel retain as much as 80% strength if not higher. This is also another reason mild tends not to crack, it bends, and will slowly start to "sink" if it sees high enough temps produced in a turbo system.

I would also guess that these cheaper company's are only using like 18-20 ga. metals, which will either bend/melt or crack much easier. Turbo manifolds should have 0.500" flanges and at least 0.060"(16ga) walls, at a minimum.