2.5 to 3.0 Exhaust

1971 CY Dodge Dart said
Thanks. I'm thinking now 2.5" exhaust may be enough for me. I plan on running Doug's headers and they come with a 3" collector that tapers down to 2.5" I believe.
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The collector seldom necks down. The “Reducer” bolts to the collector and often reduces in size. Would this be the case?