I received these the other day to join my 3" collector to my 3" exhaust and at the largest, the opening it 3" OD, not ID. As of right now it doesn't fit over my pipes. I'll know more as soon as I start assembling everything better. They feel nice and well built, but if I can't get them over the ends of my 3" pipes then they're worthless. There isn't enough adjustment in the bolts.
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