I remember a mates Mk4 Anniversary TDI with REVO St2, (plus exhaust, de-cat, inlet etc on top of the bigger turbo and I/C) make 1 BHP and 10 lb-ft more than my Fabia vRS which was standard bar a 2nd hand Tuning Box.
His was a 150 to start with...whereas the Fabia was a 130.
Odd..
He wasn't best pleased either.