Suddenly loud roar from engine- coming from front of car- previously cat, right?

OK I know very little more or less cars, but I spent time with some friends who fixed our cars commonly and taught me, so i twig some things.
If the muffler were cracked, would I seize the noise from the subsidise, from the whole vehicle?
Wouldn't the noise be loudest fundamental the problem in the system?

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Answers:    Year, produce and model? Some cars had problems beside the seal going desperate between the exhaust manifold and header pipe or header/front pipe to the cat converter. Could also be an nouns injection system problem if your car have that. Pinpoint the noise to see what's wrong.

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resourcefully if it is exhaust, you could have an exhaust dribble somewhere after the manifold or headers. but you better build sure its the exhaust system and not the engine.

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