The difference in the motors is the turbo & timing...

01: k03 turbo = 150hp (mine dyno'd just that w/ almost no loss )
02: k03s turbo = 180hp
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^ if your deciding between the two i would get the 01 if its a 4dr golf(rare), b/c they are cool , and the motors respond to ups very good.

02, you don't have to make up for that 30hp difference and chipped you should be in the 200's range.