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2 1/4, at least from what i hear from pretty much every exhaust shop and auto part store, so im g oin with the flowmaster 40 series, 2 1/4 in, 2 1/4 out duals
i did measure it, 2.5 but im finding **** about it being different before the muffler, god damn man no need for an attitude, i deal with enough bull ****, i rather be safe than sorry and stuck with waiting to return the wrong muffler and get the right one, sorry im not taking your advice my king