Right i had a search found some stuff but nothing that really told me what i needed to no. What is the reason for going k03s and turbo back system with the stage 2 is it just to get the power..? would it not work fine with what i got a cat back, jetex filter, can get a fmic and 4 bar fpr, and i got the standard k03 would it not work fine but just produce less power untill i get a k03s and the rest of exhaust fitted reason for asking is i can get hold of a stage 2 ecu but cant afford a k03s or d/p and cat at the moment. If it would work any idea's what sort of power before the k03s.