Muffler problems

My car suddenly started running very loudly, and I’m assuming it’s a muffler issue. How much does it cost to replace a muffler? I have 94 Mazda Miata. Also, what happens if I don’t replace it? What are the effects of a bad muffler? Thanks!

Hearing loss, angry neighbors, Carbon Monoxide poisoning, ticket,

If it is really a bad muffler, the problem is primarily the noise pollution. It is also possible that you could get a ticket for the noisy exhaust system.

That said, it is very important that you check for leaks in the exhaust system ahead of the muffler. Leaks can cause exhaust gases to infiltrate the interior of the car.