Intake manifold. Copied Elddebrock performer RPM.
I am using a Crosswinds intake on my 5.9 magnum build. Strictly a street engine. I gasket matched the intake ports. I did have to hog out the bolt holes a little to mount to my EQ heads. I also drilled and tapped the casting blank seen on the driver's front for my AC bracket.
Couple thousand miles so far. Happy with the intake.