[Alan Roehrich]

I cannot see where there would be any ET in a material change from mild steel to stainless.

The ET in headers is purely design, tube diameter, and tube length.

Coating is worth as much as 2.5%.

The correct steps in tubing diameter can be worth as much as 2%.

In order to take full advantage of merge collectors, a cam change may be necessary.

In order to make a set of "tri-Y" or 4-2-1 headers work, as opposed to s set of 4 into 1 headers, you would probably also need a cam change.

Jere Stahl has closed his doors, the only thing he's shipping now is pre bent kits he had left over.

If you want 4 into 1, Kromer is building headers again, or Mark Lelchook.

For 4-2-1 stuff, you have Calvin Elston and Mark Lelchook.

I have friends running headers from all three of those shops, and all are happy.