sidewinder exhaust with heater connection

Hey everyone,
I hope someone can help with a quick query . . .
I need to plug the T piece heater tubes on my exhaust as I won’t be using them due to lack of space. I didn’t have much room to work with and had to cut some of the flange off to install the exhaust so it’s not as simple as buying a backing plate 😠

Any ideas how to plug this hole? Could I tap a thread? Muffler silicon and a “cap” of sorts?
Thanks for any help

T piece? Can you post up a picture so we know what you are talking about?

Pretty sure he is talking the pre-heat riser to the manifold

Can you weld it??

Why was there no room??