Did they revise the K03 turbo at all? Was yours a brand spanking new one from VW; that's an awesome set of numbers for S1 K03.
I am not too sure mate, Statller Power developments in sheffield ordered me a brand new Borg warner k03.
I run it on Vpower, use Millers Nano tech oil, have a helix stage 1 clutch and flywheel (355ftlbs limit), neuspeed intake, the down pipe may have had its pre cat removed but i am not 100% (emissions are spot on), its actually from an S3 but its the same size as the OEM golf gti.
Nik Gower take a bow son