Q: My exhaust is really loud at the engine. What is it?

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I was driving along (car was quiet) and when I put my foot on the gas, it was so loud!! It's coming from the engine. I didn't run anything over or hit a pothole. I'm wondering how much this will cost. Can I have a friend fix it or should it go to a garage? This car is turning into a MONEY PIT!! Thank you for any help...

My car has 220000 miles.
My car has an automatic transmission.

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