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Message: [QUOTE="steedspeed, post: 455908, member: 4952"] At 2200 I'd think any manifold would have trouble. I always try to keep my minimum thickness to .2 inch. I use hot rolled mild steel which is stable and has very little "tension" in it so it retains its shape when cutting it and when it is heated. Some materials and especially stainless usually have a lot of tension in them from being formed at the factory. When you cut them you get distortion as the tension is released on the side being cut. Heat also makes the material "relax" which again makes it move and distort. Best way to explain it is that the material is crushed on the outside as it is formed. The outer surface is hardened by the crushing where the inner material is left soft. So you have a material with a soft inner core and a hard skin. Cut the "skin" on one side and the skin on the other side will contract and "pull" the material into a curve. When machining materials which are cold rolled you always have to remove material from both sides to keep it flat. [/QUOTE]

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