So I am having a similar problem... I was running catless headers and everything was running fine. I installed my stock headers again and am having these same codes thrown. Everything was fine before... is it just a coincidence that I am now having a vac leak because that is what I keep seeing people say about having similar problems.
D2 Racing Sport Suspension ~ aFe CAI ~ AA Tune ~ Orion AEs ~ Topspeed Exhaust ~ Euro Headers ~ UUC SSK Evo 3 and DSSR ~ 15% Tint Windows and 50% Windshield