you shouldnt need a re-tune. I would only keep it at 9-10 psi mac though. You def need a wideband bro. These KA's are fun but one little thing goes wrong and boom. When i built my KA-T the first thing i bought was an innovate lc-1. Personally i would get some stock STI injectors (yellow top = sidefeed, pink top = top feed.) Then i would get a n62 maf (because IIRC the n60 can only safely read up to about 270hp) Then you get a new set of chips from enthalpy (great choice by the way) install it all and turn it to 12psi.
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