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yes, I agree the stock 02 housing on them is a bottleneck, however 3" exhaust will hands down see better boost response than a 2.25" exhaust.
blow through a full straw, see how hard it is, cut a 1/2 piece from that straw tape it to a garden hose and see how much easier that is.
also, by your theory exhaust that is anybigger than the exit for the exhaust side on a turbo is a waste.
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