just wana know whats the best turbo setup for a 2003 A4 THANX

there is no best setup. There is prefered setup. What numbers do you wish to get, be realistic we all want couple of thouthands.

levels by mine book:
Ko3 - stock
Ko3 + chip
Ko4 - GT25
GT28
GT28rs
GT2871
GT32
GT35rs
GT03/04