Originally Posted by GMBALL

So to me it happens only ocasionally (maybe every 3rd or 4th run), mostly 4th or 5th gear and in 95% only during WOT. Speed 115-130MPH. I have changed plugs to Weistec one-step colder, dissapeared for some time, but then reappeared again. I have renntech stage 2 ecu tune/weistec tcu/downpipes/turbo-backs/3"exhaust/sport cats/blackboost cai. It started doing it about 2 years after the stage 2 tune, but it began right after I have installed turbo-backs - my guess is that it added quite a bit to already high power levels and basically it now here and there falls into overboost territory. I have no idea what to do with this issue.