Dont you have a Polo GTI Cup Edition in UK? Thats the 180hp Version of the "normal" GTI.
To clear up some things a little: There is actually no turbo called k03"S" at kkk/borg warner.
This name was created by some users/tuners/forums whatsoever, but is not a name used by the manufacturer.
The difference between the "small" k03 and the so called k03s ist the compressor side.
The k03s (k03-052/82, K03-2075EYD5.88KCAXH per example) has a 8 blade compressor wheel which has:
Inducer Diameter 38.1mm
Exducer Diameter 51mm
while the smaller k03 (k03-025, K03-2072GAA5.88KCAXK per example) has a 12 blade compressor wheel with:
Inducer Diameter 36mm
Exducer Diameter 50mm
but both have same turbine size with 11 blades and
Inducer Diameter 45mm
Exducer Diameter 40.3mm
Regards, Alex