Davis Step Headers???

Stahl made a living out of header work as does Mark Lelchook, Calvin Elston , Greg Holman and many others. I hope they read your comments.
Maybe you can give us a class on what the header does for the engine efficiency and affect piping size has on the head at speed. Probably not.
Your lack of class towards racers and fabricators amazes me. Who would invest in your program reading this garbage?

Oh and Happy Thanksgiving.