I just realized I've been driving without a catalytic converter. What to do?

Like 2 years ago my car was making strange noises and was having trouble shifting. My mom took it to one of her friends to work on. She didn't tell me what he did, but it was running like new, so I didn't care. Well she just told me he removed the catalytic converter or something like that. I read that it produces a lot more pollution, now I feel like a dick driving around like that for two years.

I just realized I've been driving without a catalytic converter. What to do?
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