Good luck finding a replacement. Many of them are broken.
Can it be welded: Yes. Take it to a welding shop, it's aluminum.
Can you leave it off? Well.... I suppose if you could fab up something that works the same way, then yes. But you really need that heat shield around the muffler. The idea is that the air coming off the engine also blows across the muffler and carries the heat out the front. Without it, the engine compartment gets too hot, and it may burn the paint.
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