What is this?

The threaded plug in the floor of the intake doesn't effect the operation of the EGR valve. Like I said earlier, unless you just don't like the looks of it sitting there, just take the hose off and plug the supply end. A non-working EGR valve is just a block-off plate. If you remove the valve, you need to make a good thick plate and get a gasket for the opening or it will leak. Either way, no effect on performance.....after all, it just a 2bbl, so, not high performance anyway.