Intake manifold. Copied Elddebrock performer RPM.

Sold under a lot of different names; Speedmaster, Crosswind, DeepMotor, et al...
Chinese AirGap knockoff, but as stated; not a race intake, but depending on your build it's not a bad street intake and a cheap way to get a 4bbl. on a Magnum. Not quite 340 ports, better than 318 ports, decent match to Magnums. A little cleanup work can get it working decently with any of them. Heck, it seems like even the real Eddies lately have needed work to get them ready to use.
At under two bills, compared to 400 and up for the RPM and AirGap, it's a good consideration for a budget build.