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16619 and i love it. I paired it with the CA header and it sounds amazing. Nice, low rumble. Gets to a good sound level at WOT. I have zero complaints about my exhaust
the 16618 is a 2.25" exhaust and the 16619 is a 2.5" exhaust. On magnaflow.com they say to use 16619 for the 2.0 and the 2.4, I would recommend the same thing