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Most test shops partially block the tail pipe. Any whistling means there is a leak that must be fixed for safety reasons.
I assume you have a sedan. The DOT law states that all exhaust must exit behind or above the passenger compartment.
Even if you dont feel the leak is entering the passenger compartment because your windows/floor/etc is sealed, it is still a hazard.
Bottom line, you had a dangerous exhaust leak and fixed it. You are safer now. The actual gas emissions are really irrelevant.
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