Riser Block Plug

[incrediblened]

I recently tried to remove the 3/4" block plug in the riser manifold to install a brass elbow. I stuck a 1/2" drive socket wrench into the square opening and snap, the plug broke

I need to get that plug out, and I actually need to remove the brass elbow from another exhaust riser as well, but I REALLY don't want to break it.

Anyway, let me know what you think.

thanks,
Ryan