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Provided you don't have inspections, the whole thing can be removed, BUT you must plug/block the hole in the head to prevent a BIG exhaust leak.

The old backyard method is to cut off the tube a few inches from where it bolts to the head and pinch it shut. You can just see the one on the van. It was done way back by someone else.

Considering those rot and are no longer available, you might want to save it and sell to someone that does have to pass inspections.

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if tube and check valve are good someone may need it to stay on the road...if not now in the future.

I take and cut the tube and pinch the end then fill short tube up with copper rtv and let that cure so it does not leak.

you can tap the head 1/2 pipe thred or maybe find a press in core plug that size and tapp it in the head to plug it.