Issues in 85 ford LTD crown vic

Been doing some maintenance on my car and was wondering about some noises I’m hearing. It only occurs when I coast and the engine brakes itself, but it is a sound similar to a boat or jetski at low speed in the water, a ”blub-BLUB" sound coming through my exhaust ( I only notice it due to a break in my exhaust that occurs under my seat, the replacement is on the way for that). It happens at an irregular rhythm.

Is there a probable cause for this?

It’s called exhaust burble and usually occurs on the overrun. All cars do it, you’re only hearing it due to the broken exhaust.

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Yes there is, the broken exhaust pipe.

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