Can you post a link to where an M1 already has the bungs? I looked all over the place for one before I bought the Super Victor.
I didn't even see where they had the pads to accept the bungs. I am pretty sure the bung holes need to be drilled and then the bungs WELDED onto the intake runners and then the Hold Down pad would need to be machined in as well along with being drilled and tapped.