when i installing my split dump, the turbo seem original.
the bolts that was holding the dump pipe pretty much rusted, stucked hard.
snapped 1 of the bolt while taking it off.
SO i dun fink I have aftermarket turbo,
If the figure is rite,
my best bet is the ECU,
but when i bought my car,
it stock as a rock, as it seem so, and it fresh imported.