My car suddenly making lawn mower noise?

I drive my car everyday, at least an hour, maybe accelerate more than I should. I was driving and then stopped, had my car sit in one place for a few minutes turned it off then turned my car on a little bit after and now when you accelerate it sounds like a lawn mower or small semi, even at 20 mph. It seems to be coming from the left side of the motor around where you can check the oil. I have a 2006 Honda Civic.

Exhaust leak. Maybe a blown donut, cracked manifold or rusted out pipe.

Have you opened the hood to look?
You've either blown a hole in your exhaust system or the manifold has come loose.

It's probably an exhaust leak at the front exhaust pipe flex pipe.

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