you blew a head gasket. likely you hit a bump really hard and it shifted the exhaust manifold so that it is not maintaining a proper seal. Essentially your exhaust fumes are leaking out near the engine block causing a Shhh Shhh Shhh Shhh sound everytime the cylinders fire. You might have a broken motor mount from a hard impact as well, when these break it allows the engine to shift around more, causing things to come apart and leak.
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