2.5T is a semi-closed deck, as opposed to the open NA motor. Heads are totally different with respect to cams, valves, etc. The 2.5T motors have AVCS (variable valve timing), and there's other stuff, I'm sure.....
I dunno if there's any difference in cylinder liners or anything, though.
But yeah, forged rods, crank, lower comp pistons, etc...
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