Considering the high output of 218 hp from just a 2-liter engine, I'd suspect some vital elements might be strengthened in comparison to the regular 20d. Perhaps forged crankshaft, etc.?
The turbocharger you mention is certainly different (or at least tuned differently), but it's not a part/subassembly that must withstand the increased load...
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previous: 2003 E46 330i SMG
just sold: 2013 F10 528i xDrive
my AWD beater: 2015 Golf R mk7 DSG
my RWD pirate & long-distance cruiser: 2015 M235i AT8, LSD
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