He is running Digi-1 injection and ignition (look at the injectors in the inlet manifold) so the engine isn't FSI any more. Because of the high c/r (10,5:1 i believe) he wont be able to run high boost and much ignition advance because of the normal injection, if he changes to FSI back with the OEM managemant or a standalone with FSI capability (so no KMS or DTA) he would have standard performance or more.

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1991 Golf GTI 20v 4x4 677pk
1989 Golf 20v turbo 4motion
1990 Golf GTI G60
1990 Golf GTI 16vG60
1991 Golf GTI G60
1991 Golf GTI Edition one G60
1983 Golf GTI 16vG60
1983 Golf GTI G60
2000 Audi S3