Hey everyone. So I just installed a ko4 on my B5 A4 Quattro and Iím experiencing some overboot. The car has the GIAC stage 1 tune already along with a cone filter and catless exhaust. Has anyone else slapped a ko4 on their b5 like that before or experienced the same thing? Iím thinking of just adjusting the wastegate possibly? Let me know. Seems once it goes passed 20 the car starts to misfire. Any advice is appreciated.


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