Why is the performance in H.P and Torgue in an audi A4 1.8t diffrent between the years 2000 and 2001?

Im but a Audi a4 1.8t soon between 2000 and 2001. The HP in a 2000 is 150 and the torgue is 155. The 2001s HP is 170 and torgue is 166. Is it that they upgraded the turbo between the two years or did they do something diffrent between them? thanks for your help.Why is the performance in H.P and Torgue in an audi A4 1.8t diffrent between the years 2000 and 2001?Because they made a new turbocharger that adds more power.

The same goes for the VW GTI 2001 and 2002.

The 2001 had 150HP and the 2002 GTI had 180HP.Why is the performance in H.P and Torgue in an audi A4 1.8t diffrent between the years 2000 and 2001?yea differnt turbo i would go with higher hp one 150 isnt much 170 is good the torque will be how hard it pulls