I did a cheap delete since they were a bit leaky due to loose shaft. I read about it on a forum from Europe. I didn't want to have to remove the manifold again , which I would have to do if I ordered blanks.

Remove flaps.
Cut across the plastic and shaft near the rotating sleeve on the side that goes inward to be able to pull out the shaft from that hole.
Replace the hole by threading a screw from the out side into the hole left using thread locker or some strong epoxy.

No change in power, response or idle.