To my recollection it is 2.5".
Definitely looks like it needs a new one there. With that much soot escaping I would look for possible excess backpressure in the exhaust also, though, maybe a plugged muffler or resonator.
Is all the black on the inner fender there from leaking exhaust? Even if this gasket goes bad I would not expect to see that much leakage in this location unless there is a restriction downstream.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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