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1st gen DSM's are a 14b style round entry exhaust flange and evoIII 16g's are virtually the same, 2nd gen DSM's are a t-25 style flange.
Even though the 2G has a Garrett T25, it does not use the standard Garrett T2 flange. It has the same round entry flange as a 1G, making the exhaust manifolds interchangeable.